Clean up and standardize landing pages

doc index.rst:
1. Update intro sentence to read as a complete sentence
2. Remove unused toctree
3. Correct heading levels (impacting side nav and correct rendering of content)
4. Remove "Indices and Tables" section: genindex page not used, search searches
only index (not useful here)

api-ref index.rst:
1. Update intro sentence to read as a complete sentence
2. Update text around search link for consistency (move to follow intro)
3. Add heading before toctree for consistency with other pages

releasenotes index.rst:
1. Standardize page title reST markup
2. Remove search (make consistent with other openstack release note pages)

Change-Id: Ia12c5b865f3e4c973a7f403bbf787e7c91bf34a3
Signed-off-by: Kristal Dale <kristal.dale@intel.com>

api-ref/source/index.rst

@@ -2,11 +2,14 @@
 stx-nfv API Reference
 =====================
 
-StarlingX NFVI Orchestration
+Use the StarlingX stx-nfv API for NFVI orchestration.
+
+stx-nfv API content can be searched using the :ref:`search page <search>`.
+
+API Reference
+-------------
 
 .. toctree::
    :maxdepth: 2
 
    api-ref-nfv-vim-v1
-
-:ref:`search`

doc/source/index.rst

@@ -1,11 +1,8 @@
+=====================
 stx-nfv Documentation
 =====================
 
-StarlingX NFVI Orchestration
-
-.. toctree::
-   :maxdepth: 2
-   :caption: Contents:
+This is the documentation for StarlingX NFVI orchestration.
 
 Release Notes
 -------------
@@ -24,7 +21,7 @@ API Reference
    API Reference <https://docs.starlingx.io/api-ref/stx-nfv>
 
 Links
-=====
+-----
 
 * Source: `stx-nfv`_
 * Code Review: `Gerrit`_
@@ -33,9 +30,3 @@ Links
 .. _stx-nfv: https://git.starlingx.io/cgit/stx-nfv/
 .. _Gerrit: https://review.openstack.org/#/q/project:openstack/stx-nfv
 .. _Storyboard: https://storyboard.openstack.org/#!/project/openstack/stx-nfv
-
-Indices and Tables
-==================
-
-* :ref:`search`
-* :ref:`genindex`

releasenotes/source/index.rst

@@ -1,3 +1,4 @@
+=====================
 stx-nfv Release Notes
 =====================
 
@@ -5,5 +6,3 @@ stx-nfv Release Notes
    :maxdepth: 2
 
    unreleased
-
-:ref:`search`