app: make it possible to serve lldap behind a sub-path

app/index.html

@@ -4,7 +4,8 @@
 <head>
     <meta charset="utf-8" />
     <title>LLDAP Administration</title>
-    <script src="/static/main.js" type="module" defer></script>
+    <base href="/">
+    <script src="static/main.js" type="module" defer></script>
     <link
       href="https://cdn.jsdelivr.net/npm/bootstrap-dark-5@1.1.3/dist/css/bootstrap-nightshade.min.css"
       rel="preload stylesheet"
@@ -33,7 +34,7 @@
       href="https://fonts.googleapis.com/css2?family=Bebas+Neue&display=swap" />
     <link
       rel="stylesheet"
-      href="/static/style.css" />
+      href="static/style.css" />
     <script>
       function inDarkMode(){
         return darkmode.inDarkMode;