[DUX-1499] Support running an application

[9999years]

It's nice to run an application like a web server instead of running tests. This may require some additional hooks.

_{From SyncLinear.com | DUX-1499}

[running-grass]

@9999years

Thank you for implementing this feature. Now that the issue has been marked as completed, could you provide some guidance on how to use ghciwatch to run a server application? Specifically:

1. Are there any new configuration options or commands to enable server mode?
2. Is there documentation available on how to set up ghciwatch for running and auto-reloading a web server or similar application?
3. Are there any best practices or examples you can share for using this new functionality?

Any information on how to effectively utilize this new feature would be greatly appreciated by the community.

[9999years]

Filed a documentation ticket at #315, see #315 (comment) for an initial response (though there's still work to be done for this feature).