Use Remix icons and set up navbar properly

Too lazy to separate these changes into multiple commits.

gdn-app/src/components/Navbar.vue

@@ -0,0 +1,19 @@
+<script setup lang="ts">
+import { RiArrowDropDownLine, RiSettings3Fill } from "@remixicon/vue";
+</script>
+
+<template>
+  <div class="flex justify-between bg-black p-2 text-white">
+    <div
+      class="cursor-default rounded-md bg-neutral-800 pl-2 text-lg hover:bg-neutral-700 active:bg-neutral-500"
+    >
+      GedächtNAS
+      <RiArrowDropDownLine class="inline" />
+    </div>
+    <div
+      class="flex items-center rounded-md bg-neutral-800 px-1 hover:bg-neutral-700 active:bg-neutral-500"
+    >
+      <RiSettings3Fill class="h-4" />
+    </div>
+  </div>
+</template>