feat: enhance README and TODO documentation, implement mobile menu functionality in Header component

- Updated README.md with project details, quick start instructions, and tech stack.
- Expanded TODO.md to reflect current project status and backlog items, including Linear ticket synchronization.
- Added mobile menu toggle functionality in Header component with corresponding tests for user interactions.
- Configured Next.js for Docker deployment and optimized build settings.

docker/mongodb/init-mongo.js

@@ -0,0 +1,49 @@
+// MongoDB initialization script for development environment
+// This script runs when the MongoDB container starts for the first time
+
+// Switch to the mozdit database
+db = db.getSiblingDB('mozdit');
+
+// Create collections with initial data
+db.createCollection('site_config');
+db.createCollection('contact_submissions');
+db.createCollection('users');
+
+// Insert initial site configuration
+db.site_config.insertOne({
+  type: 'site_config',
+  environment: 'development',
+  data: {
+    general: {
+      name: 'mozdIT Bt.',
+      description: 'Professzionális webhosting, email szolgáltatás és DNS adminisztráció',
+      url: 'http://localhost:3000',
+      locale: 'hu-HU'
+    },
+    contact: {
+      email: 'info@mozdit.hu',
+      address: 'Budapest, Magyarország'
+    }
+  },
+  lastModified: new Date(),
+  createdAt: new Date()
+});
+
+// Create indexes for better performance
+db.contact_submissions.createIndex({ "email": 1 });
+db.contact_submissions.createIndex({ "timestamp": -1 });
+db.site_config.createIndex({ "type": 1, "environment": 1 }, { unique: true });
+
+// Create a development user (optional)
+db.users.insertOne({
+  username: 'dev',
+  email: 'dev@mozdit.hu',
+  role: 'admin',
+  createdAt: new Date(),
+  isActive: true
+});
+
+print('MongoDB initialized successfully for development environment');
+print('Database: mozdit');
+print('Collections created: site_config, contact_submissions, users');
+print('Initial data inserted');