🧱 update CI workflow and remove alpinejs frontend files

frontend/deno.json

@@ -0,0 +1,9 @@
+{
+  "tasks": {
+    "start": "deno run --allow-net --allow-read --allow-write --allow-env --allow-run --watch main.ts"
+  },
+  "imports": {
+    "@dx/alpine-server": "jsr:@dx/alpine-server",
+    "@oak/oak": "jsr:@oak/oak@^17.2.0"
+  }
+}