Bug 1730515 - FX doc: Use google search instead of sphinx search r=firefox-source-docs-reviewers,ahal DONTBUILD

sphinx search is pretty bad...

Differential Revision: https://phabricator.services.mozilla.com/D128022

docs/_templates/searchbox.html

@@ -0,0 +1,16 @@
+<! -- This code is governed by the BSD license -->
+
+<div>
+   <h3>{{ _('Quick search') }}</h3>
+   <script>
+      (function() {
+         var cx = 'dd12886298f75dbef';
+         var gcse = document.createElement('script');
+         gcse.async = true;
+         gcse.src = 'https://cse.google.com/cse.js?cx=' + cx;
+         var s = document.getElementsByTagName('script')[0];
+         s.parentNode.insertBefore(gcse, s);
+      })();
+   </script>
+  <gcse:search></gcse:search>
+</div>

docs/conf.py

@@ -70,6 +70,13 @@ templates_path = ["_templates"]
 source_suffix = [".rst", ".md"]
 master_doc = "index"
 project = "Firefox Source Docs"
+# Override the search box to use Google instead of
+# sphinx search
+html_sidebars = {
+    "**": [
+        "searchbox.html",
+    ]
+}
 html_logo = os.path.join(
     topsrcdir, "browser/branding/nightly/content/firefox-wordmark.svg"
 )