ensure that the base href is set, as it's required when reloading subpages.

fixes #264

webapp/frontend/src/index.html

@@ -4,6 +4,10 @@
         <meta charset="utf-8">
         <title>scrutiny</title>
 
+        <script>
+            document.write(`<base href="${window.location.pathname.split('/web').slice(0, 1)[0]}/web/"/>`);
+        </script>
+
         <meta name="viewport"
               content="width=device-width, height=device-height, initial-scale=1.0, minimum-scale=1.0">