New features

Option to enable external traffic
- Specifying --external will start the server listening to all traffic, rather than only binding to localhost. This will also enable TLS and generate a self-signed certificate, but you can use your own certificate via --tls-cert <FILE> and --tls-key <FILE>.
Override content directory
- Instead of the default behavior of using the current working directory, you can serve content from another directory by specifying it as the last argument: godot_web [OPTIONS] [DIR]

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