Enhance README and RPC for package management

- Added instructions to README.md for building an ISO from source and flashing it to USB.
- Introduced a new RPC method for package installation, including security checks and container management.
- Updated Docker and Podman integration in build scripts to support both container runtimes.
- Enhanced Nginx configuration for improved timeout settings and WebSocket support.
- Added new app metadata for additional applications in the Docker package scanner.

docker/bitcoin-ui/assets/icon/favico-black.svg

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docker/bitcoin-ui/assets/img/bitcoin.svg

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docker/lnd-ui/assets/icon/favico-black.svg

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