Docs: Clean and restructure the Integration guide

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Change-Id: I8dca6e3d5cf5cae3a5cd3dc8f2b1e518ab3c20cf
diff --git a/docs/integration_guide/index.rst b/docs/integration_guide/index.rst
index 31b470b..703c4f7 100644
--- a/docs/integration_guide/index.rst
+++ b/docs/integration_guide/index.rst
@@ -10,9 +10,8 @@
 
     NS client integration <non-secure_client_extension_integration_guide.rst>
     OS migration to Armv8-M <os_migration_guide_armv8m.rst>
-    tfm_fpu_support.rst
-    tfm_secure_irq_integration_guide.rst
-    How to add a partition <services/tfm_secure_partition_addition>
+    tfm_fpu_support
+    Secure Interrupt <tfm_secure_irq_integration_guide.rst>
 
 .. toctree::
     :maxdepth: 2