Fix frontend for seperate backend, and make preferences page

env.d.ts

@@ -1 +1,11 @@
 /// <reference types="vite/client" />
+
+interface ImportMetaEnv {
+    readonly VITE_BACKEND_URL: string
+    readonly VITE_INSTANCE_URL: string
+    // more env variables...
+  }
+  
+  interface ImportMeta {
+    readonly env: ImportMetaEnv
+  }