fix: copied sphinx_rtd_theme to further shrink filesize

theme/custom_sphinx_rtd_theme/searchbox.html

@@ -0,0 +1,9 @@
+{%- if 'singlehtml' not in builder %}
+<div role="search">
+  <form id="rtd-search-form" class="wy-form" action="{{ pathto('search') }}" method="get">
+    <input type="text" name="q" placeholder="{{ _('Search docs') }}" />
+    <input type="hidden" name="check_keywords" value="yes" />
+    <input type="hidden" name="area" value="default" />
+  </form>
+</div>
+{%- endif %}