docs: Documentation restructure

- Change main index structure
- Sort out integration and porting guidelines
- Resort table with releases
- Add Tools section. To be adjusted further for tf-m-tools

Intention to minimise files movement to simplify review process.
Affected files shall be moved later after the new structure agreement.

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Change-Id: I0352bebabe09d4f7b5e8848ee620c0cea6881c94
diff --git a/docs/glossary.rst b/docs/glossary.rst
index 2ee18e7..83e283d 100644
--- a/docs/glossary.rst
+++ b/docs/glossary.rst
@@ -49,7 +49,7 @@
         permitted.
 
     SP
-        Secure Partition:
+    Secure Partition
         A logical container for secure services.
 
     SPE
@@ -57,7 +57,7 @@
         `PSA term`_. In TF-M this means the secure domain protected by TF-M.
 
     SPM
-        Secure Partition Manager
+    Secure Partition Manager
         The TF-M component responsible for enumeration, management and isolation
         of multiple Secure Partitions within the TEE.
 
@@ -76,10 +76,12 @@
         view, i.e. which is viewed as a single entity from a TF-M point of view.
 
     PS
-        Protected Storage service provided by TF-M.
+    Protected Storage
+       One of PSA services provided by TF-M.
 
     ITS
-        Internal Trusted Storage service provided by TF-M.
+    Internal Trusted Storage
+       One of PSA services provided by TF-M.
 
     TFM
     TF-M