Docs: Add configuration section to the doc

+ Rebase and include ARoT-less profile

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Change-Id: If802fa15297fe25585c7523ad0827395d982c554
diff --git a/docs/index.rst b/docs/index.rst
index a4ee9c9..f03abac 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -87,6 +87,7 @@
 
     Platform Selection<platform/index>
     building/tfm_build_instruction
+    configuration/index
     integration_guide/index
     technical_references/design_docs/index
     Tools <tools/index>