Add some validations to use firebase

.firebaserc

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+{
+  "projects": {
+    "default": "neatlab-newsletter"
+  }
+}

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+firebase-debug.log*
+firebase-debug.*.log*
+
+# Firebase cache
+.firebase/
+
+# Firebase config
+
+# Uncomment this if you'd like others to create their own Firebase project.
+# For a team working on the same Firebase project(s), it is recommended to leave
+# it commented so all members can deploy to the same project(s) in .firebaserc.
+# .firebaserc
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env

firebase.json

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+{
+  "storage": {
+    "rules": "storage.rules"
+  }
+}

index.js

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-// Here the logic
+  // Import the functions you need from the SDKs you need
+  import { initializeApp } from "https://www.gstatic.com/firebasejs/10.12.2/firebase-app.js";
+  import { getAnalytics } from "https://www.gstatic.com/firebasejs/10.12.2/firebase-analytics.js";
+  // TODO: Add SDKs for Firebase products that you want to use
+  // https://firebase.google.com/docs/web/setup#available-libraries
+
+  // Your web app's Firebase configuration
+  // For Firebase JS SDK v7.20.0 and later, measurementId is optional
+  const firebaseConfig = {
+    apiKey: "AIzaSyCkhy-UrrKxASz3-qTYQB41PDSXA4vQ2tM",
+    authDomain: "neatlab-newsletter.firebaseapp.com",
+    projectId: "neatlab-newsletter",
+    storageBucket: "neatlab-newsletter.appspot.com",
+    messagingSenderId: "773482401232",
+    appId: "1:773482401232:web:d31d2ecf6a85676787bdd5",
+    measurementId: "G-RCFKL1L07V"
+  };
+
+  // Initialize Firebase
+  const app = initializeApp(firebaseConfig);
+  const analytics = getAnalytics(app);

storage.rules

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+rules_version = '2';
+
+// Craft rules based on data in your Firestore database
+// allow write: if firestore.get(
+//    /databases/(default)/documents/users/$(request.auth.uid)).data.isAdmin;
+service firebase.storage {
+  match /b/{bucket}/o {
+    match /{allPaths=**} {
+      allow read, write: if false;
+    }
+  }
+}