refactor: update environment configuration and documentation

- Modified `.env.example` to reflect new API URL structure and added CDN configuration for external storage.
- Updated `.gitignore` to include deployment secrets and certificate files, ensuring sensitive information is not committed.
- Revised `BACKEND_INTEGRATION.md` to clarify authentication methods, replacing Cognito references with Nostr NIP-98.
- Deleted outdated documentation files (`CONTENT-INTEGRATION-COMPLETE.md`, `CURSOR-MCP-SETUP.md`, `FINAL-STATUS.md`, `FIXES-APPLIED.md`, `INDEEHHUB-INTEGRATION.md`, `PROJECT-COMPLETE.md`, `PROJECT-SUMMARY.md`) to streamline project documentation.

These changes enhance the clarity of the environment setup and improve the overall documentation structure for better developer onboarding.

tailwind.config.js

@@ -18,8 +18,8 @@ export default {
         'glass-darker': 'rgba(0, 0, 0, 0.6)',
         'glass-border': 'rgba(255, 255, 255, 0.18)',
         'glass-highlight': 'rgba(255, 255, 255, 0.22)',
-        'netflix-red': '#E50914',
-        'netflix-black': '#141414',
+        'accent-red': '#E50914',
+        'surface-dark': '#141414',
       },
       boxShadow: {
         'glass': '0 8px 24px rgba(0, 0, 0, 0.45)',