Move frontend code (= all current code) into portal/{static,template} dirs

css/main.css → portal/static/css/main.css

-@import url("/lib/fontawesome-free-6.5.2-web/css/all.min.css");
+@import url("/static/lib/fontawesome-free-6.5.2-web/css/all.min.css");
 
 /* ----------------------- Variables ----------------------- */
 
@@ -35,11 +35,11 @@ body {
 }
 
 body.blue {
-    background-image: url("/lib/nautilus/nautilus_blue.svg");
+    background-image: url("/static/lib/nautilus/nautilus_blue.svg");
 }
 
 body.green {
-    background-image: url("/lib/nautilus/nautilus_green.svg");
+    background-image: url("/static/lib/nautilus/nautilus_green.svg");
 }
 
 header {

js/portal.mjs → portal/static/js/portal.mjs

 import { All } from "./components/pages/AllServices.mjs"
 import { Start } from "./components/pages/Start.mjs"
 import { Unlock } from "./components/pages/Unlock.mjs"
-import "/lib/mithril/mithril.min.js"
+import "/static/lib/mithril/mithril.min.js"
 
+// See https://mithril.js.org/route.html#routing-strategies
+m.route.prefix = ""
 m.route(document.body, "/", {
     "/": Start,
     "/all-services": All,