fix(version): add a workaround for document ver

Add a workaround in the form of a css and template override for the
upstream sphinx_rtd_theme bug that removed the version section from self
hosted documentation.

readthedocs/sphinx_rtd_theme#1624

Signed-off-by: Randolph Sapp <rs@ti.com>

_static/css/theme_overrides.css

@@ -19,3 +19,11 @@
 .wy-nav-content {
     max-width: 100% !important;
 }
+
+/* Version compatibility override */
+.wy-side-nav-search>div.version {
+    margin-top: -.4045em;
+    margin-bottom: .809em;
+    font-weight: 400;
+    color: hsla(0, 0%, 100%, .3);
+}

_templates/layout.html

@@ -3,3 +3,22 @@
   <script src="https://www.ti.com/assets/js/headerfooter/analytics.js" type="text/javascript" charset="utf-8"></script>
   {{ super() }}
 {% endblock %}
+{%- block sidebartitle %}
+  {# the logo helper function was removed in Sphinx 6 and deprecated since Sphinx 4 #}
+  {# the master_doc variable was renamed to root_doc in Sphinx 4 (master_doc still exists in later Sphinx versions) #}
+  {%- set _logo_url = logo_url|default(pathto('_static/' + (logo or ""), 1)) %}
+  {%- set _root_doc = root_doc|default(master_doc) %}
+  <a href="{{ pathto(_root_doc) }}"{% if not theme_logo_only %} class="icon icon-home"{% endif %}>
+    {% if not theme_logo_only %}{{ project }}{% endif %}
+    {%- if logo or logo_url %}
+      <img src="{{ _logo_url }}" class="logo" alt="{{ _('Logo') }}"/>
+    {%- endif %}
+  </a>
+  {%- set nav_version = version %}
+  {%- if nav_version %}
+    <div class="version">
+      {{ nav_version }}
+    </div>
+  {%- endif %}
+  {%- include "searchbox.html" %}
+{% endblock %}