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- Deleted outdated documentation files (`CONTENT-INTEGRATION-COMPLETE.md`, `CURSOR-MCP-SETUP.md`, `FINAL-STATUS.md`, `FIXES-APPLIED.md`, `INDEEHHUB-INTEGRATION.md`,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.

.env.example

@@ -1,26 +1,17 @@
 # API Configuration
-VITE_API_URL=http://localhost:4000
+VITE_INDEEHUB_API_URL=/api
+VITE_CONTENT_ORIGIN=
 VITE_API_TIMEOUT=30000
 
-# AWS Cognito (if using direct integration)
-VITE_COGNITO_USER_POOL_ID=
-VITE_COGNITO_CLIENT_ID=
-VITE_COGNITO_REGION=
-
 # Nostr Configuration
 VITE_NOSTR_RELAYS=ws://localhost:7777,wss://relay.damus.io
 VITE_NOSTR_LOOKUP_RELAYS=wss://purplepag.es
 
-# CDN Configuration
-VITE_CDN_URL=https://your-cloudfront-url.com
-
-# App URL (for Nostr external identifiers)
-VITE_APP_URL=http://localhost:3000
+# CDN (when using external storage)
+VITE_INDEEHUB_CDN_URL=/storage
 
 # Feature Flags
+VITE_USE_MOCK_DATA=false
 VITE_ENABLE_NOSTR=true
 VITE_ENABLE_LIGHTNING=true
 VITE_ENABLE_RENTALS=true
-
-# Development
-VITE_USE_MOCK_DATA=false