feat: add search to every documentation pages

docs/source/_templates/sidebarlogo.html

@@ -8,6 +8,27 @@
   <iframe src="https://ghbtns.com/github-btn.html?user=kennethreitz&repo=responder&type=watch&count=true&size=large"
     allowtransparency="true" frameborder="0" scrolling="0" width="200px" height="35px"></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: 'ac965312db252e0496283c75c6f76f0b',
+  indexName: 'python-responder',
+  inputSelector: '#doc_search',
+  debug: false // Set debug to true if you want to inspect the dropdown
+})" async></script>
 
 <p>
   <strong>Responder</strong> is a web service framework, written for human beings.