chore: setup and deploy secure Firestore rules

firebase.json

@@ -1,4 +1,7 @@
 {
+  "firestore": {
+    "rules": "firestore.rules"
+  },
   "hosting": {
     "public": "frontend/dist",
     "ignore": [

firestore.rules

@@ -0,0 +1,8 @@
+rules_version = '2';
+service cloud.firestore {
+  match /databases/{database}/documents {
+    match /{document=**} {
+      allow read, write: if request.auth != null;
+    }
+  }
+}