Additional Watch Directories for mix grf.server

[entone]

allows a configuration setting for additional_watch_directories which is useful for running asset compilation when running mix grf.server and live reloading

Used like this

config :griffin_ssg,
  additional_watch_directories: ["assets/css"],
  hooks: %{
    before: [
      fn _ ->
        DartSass.install_and_run(:default, ["--no-source-map", "--style=compressed"])
      end
    ],
    after: []
  }

[goncalotomas]

Thank you for making mix grf.server better! 🙂