feat: add search to every documentation pages

docs/source/_templates/sidebarlogo.html

@@ -19,6 +19,27 @@ simple and intuitive as possible.
 
 <p><iframe src="https://ghbtns.com/github-btn.html?user=kennethreitz&type=follow&count=false"
   allowtransparency="true" frameborder="0" scrolling="0" width="200" height="20"></iframe></p>
+<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.css" />
+<style>
+.algolia-autocomplete{
+  width: 100%;
+  height: 1.5em
+}
+.algolia-autocomplete a{
+  border-bottom: none !important;
+}
+#doc_search{
+  width: 100%;
+  height: 100%;
+}
+</style>
+<input id="doc_search" placeholder="Search the doc" autofocus/>
+<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js" onload="docsearch({
+  apiKey: '8fcebdef37e2d888d63daf198ccecd08',
+  indexName: 'requests-html',
+  inputSelector: '#doc_search',
+  debug: false // Set debug to true if you want to inspect the dropdown
+})" async></script>
 
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