Make /static path relative

ui.html

@@ -17,7 +17,7 @@ this is the UI
 <input id="join_session_id" type="text" placeholder="Enter session id" />
 <button id="btn_join_session">Join session</button>
 
-<script src="/static/renderer.js"></script>
+<script src="../static/renderer.js"></script>
 <script>
     document.getElementById("btn_create_session").onclick = async function (e) {
         let data = {};