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/services/index.rst b/docs/integration_guide/services/index.rst
index 7567e78..f6251ba 100644
--- a/docs/integration_guide/services/index.rst
+++ b/docs/integration_guide/services/index.rst
@@ -1,9 +1,9 @@
+########
 Services
-=========
+########
 
 .. toctree::
     :maxdepth: 1
-    :glob:
 
     Initial Attestation <tfm_attestation_integration_guide>
     Audit Log <tfm_audit_integration_guide>
@@ -12,6 +12,7 @@
     Platform <tfm_platform_integration_guide>
     Protected Storage <tfm_ps_integration_guide>
     PSA Proxy <tfm_psa_proxy_integration_guide>
+    Adding a New Service <tfm_secure_partition_addition>
 
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