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

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

Change-Id: I0bbd0812f4f2132193724feb9b18910389dc85f4
Signed-off-by: Kristal Dale <kristal.dale@intel.com>

api-ref/source/index.rst

@@ -2,14 +2,14 @@
 stx-config API Reference
 ========================
 
-StarlingX System Configuration Management
+Use the StarlingX stx-config API for system configuration management.
+
+stx-config API content can be searched using the :ref:`search page <search>`.
+
+API Reference
+-------------
 
 .. toctree::
    :maxdepth: 2
 
    api-ref-sysinv-v1-config
-
-Search
-------
-
-:ref:`search`

doc/source/index.rst

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

releasenotes/source/index.rst

@@ -1,3 +1,4 @@
+========================
 stx-config Release Notes
 ========================
 
@@ -5,8 +6,3 @@ stx-config Release Notes
    :maxdepth: 2
 
    unreleased
-
-Search
-------
-
-:ref:`search`