update search settings in docs template

Author: james

docs/codeql/_templates/layout.html

@@ -50,15 +50,7 @@
         </a>
     </div>
     <div class="Header-item hide-sm hide-md">
-        <form class="search" action="{{ pathto('search') }}" method="get">
-            <input class="form-control input-dark" type="text" name="q" placeholder="Search" />
-            <input class="btn" type="submit" value="Search" />
-            <input type="hidden" name="check_keywords" value="yes" />
-            <input type="hidden" name="area" value="default" />
-        </form>
-        <script type="text/javascript">$('#searchbox').show(0);</script>
-
-        <div class="clearer"></div>
+        <script src="https://addsearch.com/js/?key=93b4d287e2fc079a4089412b669785d5&categories=!0xhelp.semmle.com,0xcodeql.github.com,1xdocs,1xcodeql-standard-libraries,1xcodeql-query-help"></script>
     </div>
     <div class="Header-item">