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.

proto/gherkin-scenarios.json

@@ -0,0 +1,23 @@
+{
+  "TC-001": {
+    "gherkin": "Feature: Validáció\n  As a weboldal látogató\n  I want to érvényes adatokat küldeni\n  So that sikeresen kapcsolatot felvenni\n\n  Background:\n    Given a weboldal betöltött állapotban van\n\n  Scenario: should detect invalid email formats\n    Given a felhasználó a weboldalon van\n    When a megfelelő műveletet végzi\n    Then a várt eredmény következik be\n\n  # Test Execution Details\n  # Status: PASSED\n  # Duration: 0ms\n  # Last Run: 2025-09-05T15:23:36.401Z\n  # File: undefined",
+    "functionalArea": "contact",
+    "test": {
+      "ancestorTitles": [
+        "/api/contact Unit Tests",
+        "Input validation logic"
+      ],
+      "duration": 0,
+      "failureDetails": [],
+      "failureMessages": [],
+      "fullName": "/api/contact Unit Tests Input validation logic TC-001: should detect invalid email formats",
+      "invocations": 1,
+      "location": null,
+      "numPassingAsserts": 5,
+      "retryReasons": [],
+      "status": "passed",
+      "title": "TC-001: should detect invalid email formats",
+      "file": "/Users/isari/Projects/Private/github/websitedev/proto/src/app/api/contact/route.unit.test.ts"
+    }
+  }
+}