add search bar

docs/stylesheets/extra.css

@@ -223,3 +223,11 @@ tr td {
     height: auto !important;
     margin-right: 10px;
 }
+
+.md-search__form:hover {
+    background-color: #000000b0;
+}
+
+.md-search__form:hover .md-search__icon {
+    color: white !important;
+}

mkdocs.yml

@@ -63,3 +63,4 @@ extra_css:
 plugins:
   - render_swagger
   - include-markdown
+  - search