Docs: Refine introduction

Refine the content of introduction.
Move 'releases' and 'platform supported' into their separate directory.

Signed-off-by: Summer Qin <summer.qin@arm.com>
Change-Id: Ia791ae8114401966a9512fb0d12f98068b1b775e
diff --git a/docs/introduction/readme.rst b/docs/introduction/readme.rst
index c86889d..c90f8ce 100644
--- a/docs/introduction/readme.rst
+++ b/docs/introduction/readme.rst
@@ -4,9 +4,9 @@
 
 Trusted Firmware-M (TF-M) implements the Secure Processing Environment (SPE)
 for Armv8-M, Armv8.1-M architectures (e.g. the `Cortex-M33`_, `Cortex-M23`_,
-`Cortex-M55`_ processors) or dual-core platforms.It is the platform security
-architecture  reference implementation aligning with PSA Certified guidelines,
-enabling chips,Real Time Operating Systems and devices to become PSA Certified.
+`Cortex-M55`_ processors) and dual-core platforms. It is the platform security
+architecture reference implementation aligning with PSA Certified guidelines,
+enabling chips, Real Time Operating Systems and devices to become PSA Certified.
 
 TF-M relies on an isolation boundary between the Non-secure Processing
 Environment (NSPE) and the Secure Processing Environment (SPE). It can but is
@@ -59,15 +59,6 @@
 - The ``platform`` folder currently contains platforms support imported from
   the external project and the files may have different licenses.
 
-#########################
-Release Notes and Process
-#########################
-The :doc:`Release Cadence and Process </docs/releases/release_process>` provides
-release cadence and process information.
-
-The :doc:`Releases </docs/releases/index>` provides details of
-major features of the release and platforms supported.
-
 ###############
 Getting Started
 ###############
@@ -85,9 +76,9 @@
 get started with ARMv8-M is
 `developer.arm.com <https://developer.arm.com/architectures/cpu-architecture/m-profile>`__.
 
-**********************
-Really getting started
-**********************
+**************************
+Build and run instructions
+**************************
 Trusted Firmware M source code is available on
 `git.trustedfirmware.org <https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/>`__.
 
@@ -104,66 +95,22 @@
 To port TF-M to a another system or OS, follow the
 :doc:`OS Integration Guide </docs/integration_guide/tfm_integration_guide>`
 
-Please also see the :doc:`glossary </docs/glossary>` of terms used in the project.
-
 :doc:`Contributing Guidelines </docs/contributing/contributing_process>` contains guidance on how to
 contribute to this project.
 
-Further documents can be found in the ``docs`` folder.
-
 ###################
 Platforms supported
 ###################
-    - Cortex-M55 system:
+The document :doc:`Supported Platforms </platform/ext/index>` lists the details.
 
-        - `FPGA image loaded on MPS3 board (AN547).
-          <https://developer.arm.com/products/system-design/development-boards/cortex-m-prototyping-systems/mps3>`_
-        - `Fast model FVP_SSE300_MPS2.
-          <https://developer.arm.com/tools-and-software/open-source-software/arm-platforms-software/arm-ecosystem-fvps>`_
+#########################
+Release Notes and Process
+#########################
+The :doc:`Release Cadence and Process </docs/releases/release_process>` provides
+release cadence and process information.
 
-    - Cortex-M33 system:
-
-        - `FPGA image loaded on MPS2 board (AN521).
-          <https://developer.arm.com/products/system-design/development-boards/cortex-m-prototyping-systems/mps2>`_
-        - `Fast model FVP_MPS2_AEMv8M (AN521).
-          <https://developer.arm.com/products/system-design/fixed-virtual-platforms>`_
-        - `Musca-B1 test chip board.
-          <https://developer.arm.com/products/system-design/development-boards/iot-test-chips-and-boards/musca-b-test-chip-board>`_
-        - `Musca-S1 test chip board.
-          <https://developer.arm.com/tools-and-software/development-boards/iot-test-chips-and-boards/musca-s1-test-chip-board>`_
-        - `FPGA image loaded on MPS3 board (AN524).
-          <https://developer.arm.com/tools-and-software/development-boards/fpga-prototyping-boards/mps3>`_
-        - `LPC55S69.
-          <https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/lpc5500-cortex-m33/lpcxpresso55s69-development-board:LPC55S69-EVK>`_
-        - `NUCLEO L552ZE Q.
-          <https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-mpu-eval-tools/stm32-mcu-mpu-eval-tools/stm32-nucleo-boards/nucleo-l552ze-q.html>`_
-        - `DISCO L562QE.
-          <https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-mpu-eval-tools/stm32-mcu-mpu-eval-tools/stm32-discovery-kits/stm32l562e-dk.html>`_
-        - `nRF9160 DK (nordic_nrf/nrf9160dk_nrf9160).
-          <https://www.nordicsemi.com/Software-and-tools/Development-Kits/nRF9160-DK>`_
-        - `nRF5340 DK (nordic_nrf/nrf5340dk_nrf5340_cpuapp).
-          <https://www.nordicsemi.com/Software-and-tools/Development-Kits/nRF5340-DK>`_
-        - `BL5340 DVK (lairdconnectivity/bl5340_dvk_cpuapp).
-          <https://www.lairdconnect.com/wireless-modules/bluetooth-modules/bluetooth-5-modules/bl5340-series-multi-core-bluetooth-52-802154-nfc-modules>`_
-
-    - Cortex-M23 system:
-
-        - `FPGA image loaded on MPS2 board (AN519).
-          <https://developer.arm.com/products/system-design/development-boards/cortex-m-prototyping-systems/mps2>`_
-        - `M2351.
-          <https://www.nuvoton.com/products/iot-solution/iot-platform/numaker-pfm-m2351/>`_
-
-    - Dual Core Cortex-M system:
-
-        - `PSoc64.
-          <https://www.cypress.com/documentation/product-brochures/cypress-psoc-64-secure-microcontrollers>`_
-
-    - Secure Enclave system:
-
-        - :doc:`Musca-B1 Secure Enclave. </platform/ext/target/musca_b1/secure_enclave/readme>`
-
-The document :doc:`Platform Deprecation and Removal </platform/ext/platform_deprecation>`
-lists the deprecated platforms planned to be removed from upstream.
+The :doc:`Releases </docs/releases/index>` provides details of
+major features of the release and platforms supported.
 
 ####################
 Feedback and support
@@ -171,33 +118,6 @@
 For this release, feedback is requested via email to
 `tf-m@lists.trustedfirmware.org <tf-m@lists.trustedfirmware.org>`__.
 
-###############
-Version history
-###############
-+-------------+--------------+--------------------+-------------------+
-| Version     | Date         | Description        | PSA-arch tag/hash |
-+=============+==============+====================+===================+
-| v1.0-beta   | 2019-02-15   | 1.0-beta release   |       -           |
-+-------------+--------------+--------------------+-------------------+
-| v1.0-RC1    | 2019-05-31   | 1.0-RC1 release    | v19.06_API0.9     |
-+-------------+--------------+--------------------+-------------------+
-| v1.0-RC2    | 2019-10-09   | 1.0-RC2 release    | v19.06_API0.9     |
-+-------------+--------------+--------------------+-------------------+
-| v1.0-RC3    | 2019-11-29   | 1.0-RC3 release    | v19.06_API0.9     |
-+-------------+--------------+--------------------+-------------------+
-| v1.0        | 2020-03-27   | 1.0 release        | v20.03_API1.0     |
-+-------------+--------------+--------------------+-------------------+
-| v1.1        | 2020-07-15   | 1.1 release        | 1f960947          |
-+-------------+--------------+--------------------+-------------------+
-| v1.2.0      | 2020-11-25   | 1.2.0 release      | 90c8e680          |
-+-------------+--------------+--------------------+-------------------+
-| v1.3.0      | 2021-04-07   | 1.3.0 release      | b0635d9           |
-+-------------+--------------+--------------------+-------------------+
-
-Please refer to
-:ref:`docs/releases/release_process:Release Version Scheme` for interpreting
-version numbers.
-
 .. _Cortex-M33: https://developer.arm.com/ip-products/processors/cortex-m/cortex-m33
 .. _Cortex-M23: https://developer.arm.com/ip-products/processors/cortex-m/cortex-m23
 .. _Cortex-M55: https://developer.arm.com/ip-products/processors/cortex-m/cortex-m55
diff --git a/docs/releases/index.rst b/docs/releases/index.rst
index dc8aecb..1258885 100644
--- a/docs/releases/index.rst
+++ b/docs/releases/index.rst
@@ -2,11 +2,38 @@
 ========
 
 .. toctree::
-    :maxdepth: 1
-    :glob:
+    :hidden:
 
-    *
+    1.0
+    1.1
+    1.2.0
+    1.3.0
+    release_process
+
++--------------------------------------+--------------+--------------------+-------------------+
+| Version                              | Date         | Description        | PSA-arch tag/hash |
++======================================+==============+====================+===================+
+| v1.0-beta                            | 2019-02-15   | 1.0-beta release   |                   |
++--------------------------------------+--------------+--------------------+-------------------+
+| v1.0-RC1                             | 2019-05-31   | 1.0-RC1 release    | v19.06_API0.9     |
++--------------------------------------+--------------+--------------------+-------------------+
+| v1.0-RC2                             | 2019-10-09   | 1.0-RC2 release    | v19.06_API0.9     |
++--------------------------------------+--------------+--------------------+-------------------+
+| v1.0-RC3                             | 2019-11-29   | 1.0-RC3 release    | v19.06_API0.9     |
++--------------------------------------+--------------+--------------------+-------------------+
+| :doc:`v1.0 </docs/releases/1.0>`     | 2020-03-27   | 1.0 release        | v20.03_API1.0     |
++--------------------------------------+--------------+--------------------+-------------------+
+| :doc:`v1.1 </docs/releases/1.1>`     | 2020-07-15   | 1.1 release        | 1f960947          |
++--------------------------------------+--------------+--------------------+-------------------+
+| :doc:`v1.2.0 </docs/releases/1.2.0>` | 2020-11-25   | 1.2.0 release      | 90c8e680          |
++--------------------------------------+--------------+--------------------+-------------------+
+| :doc:`v1.3.0 </docs/releases/1.3.0>` | 2021-04-07   | 1.3.0 release      | b0635d9           |
++--------------------------------------+--------------+--------------------+-------------------+
+
+Please refer to
+:ref:`docs/releases/release_process:Release Cadence and Process` for
+interpreting version numbers.
 
 --------------
 
-*Copyright (c) 2020, Arm Limited. All rights reserved.*
+*Copyright (c) 2020-2021, Arm Limited. All rights reserved.*