fix: copied sphinx_rtd_theme to further shrink filesize

theme/custom_sphinx_rtd_theme/footer.html

@@ -0,0 +1,61 @@
+<footer>
+  {%- if (theme_prev_next_buttons_location == 'bottom' or theme_prev_next_buttons_location == 'both') and (next or prev) %}
+    <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
+      {%- if next %}
+        <a href="{{ next.link|e }}" class="btn btn-neutral float-right" title="{{ next.title|striptags|e }}" accesskey="n" rel="next">{{ _('Next') }} <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
+      {%- endif %}
+      {%- if prev %}
+        <a href="{{ prev.link|e }}" class="btn btn-neutral float-left" title="{{ prev.title|striptags|e }}" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> {{ _('Previous') }}</a>
+      {%- endif %}
+    </div>
+  {%- endif %}
+
+  <hr/>
+
+  <div role="contentinfo">
+  {%- block contentinfo %}
+    <p>
+    {%- if show_copyright %}
+      {%- if hasdoc('copyright') %}
+        {% trans path=pathto('copyright'), copyright=copyright|e %}&#169; <a href="{{ path }}">Copyright</a> {{ copyright }}.{% endtrans %}
+      {%- else %}
+        {% trans copyright=copyright|e %}&#169; Copyright {{ copyright }}.{% endtrans %}
+      {%- endif %}
+    {%- endif %}
+
+    {%- if build_id and build_url %}
+      <span class="build">
+        {# Translators: Build is a noun, not a verb #}
+        {% trans %}Build{% endtrans %}
+        <a href="{{ build_url }}">{{ build_id }}</a>.
+      </span>
+    {%- elif commit %}
+      <span class="commit">
+        {# Translators: the phrase "revision" comes from Git, referring to a commit #}
+        {% trans %}Revision{% endtrans %} <code>{{ commit }}</code>.
+      </span>
+    {%- endif %}
+    {%- if last_updated %}
+      <span class="lastupdated">
+        {% trans last_updated=last_updated|e %}Last updated on {{ last_updated }}.{% endtrans %}
+      </span>
+    {%- endif %}
+
+    </p>
+  {%- endblock %}
+  </div>
+
+  {%- if show_sphinx %}
+    {% set sphinx_web = '<a href="https://www.sphinx-doc.org/">Sphinx</a>' %}
+    {% set readthedocs_web = '<a href="https://readthedocs.org">Read the Docs</a>'  %}
+    {# Translators: the variable "sphinx_web" is a link to the Sphinx project documentation with the text "Sphinx" #}
+    {% trans sphinx_web=sphinx_web, readthedocs_web=readthedocs_web %}Built with {{ sphinx_web }} using a{% endtrans %}
+    {# Translators: "theme" refers to a theme for Sphinx, which alters the appearance of the generated documenation #}
+    <a href="https://github.com/readthedocs/sphinx_rtd_theme">{% trans %}theme{% endtrans %}</a>
+    {# Translators: this is always used as "provided by Read the Docs", and should not imply Read the Docs is an author of the generated documentation. #}
+    {% trans %}provided by {{ readthedocs_web }}{% endtrans %}.
+  {%- endif %}
+
+  {%- block extrafooter %} {% endblock %}
+
+</footer>