* feat: add NGINX installer script for zero-knowledge setup
- Created a new installer script for NGINX-based setups.
- The script automates Docker, NGINX, Let's Encrypt, and Neko Rooms configuration.
- Designed for users who prefer NGINX as a reverse proxy instead of Traefik.
* docs: update README to include zero-knowledge installation instructions with NGINX
* feat: enhance IP retrieval method and add user prompt for domain continuation
* docs: update README to streamline zero-knowledge installation instructions and clarify NGINX usage
* feat: update IP retrieval fallback service to use checkip.amazonaws.com
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