Add links for infra and tc in index.rst file

Signed-off-by: Avinash Mehta <avinash.mehta@arm.com>
Change-Id: I45593ab6d6a6a70e493b7c6899cc558c7d55608d

docs/infra/readme.rst

+.. _docs/infra/readme:
 Neoverse Reference Design Platform Software
 ===========================================
 

index.rst

@@ -3,6 +3,13 @@ Welcome to Arm reference solutions documentation!
 
 .. toctree::
    :maxdepth: 2
-   :caption: Contents:
+   :caption: Infra:
 
+   docs/infra/readme
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Total Compute:
+
+   docs/totalcompute/readme