Live reloading?

Is it possible to do live reloading of content with slick? I skimmed through the docs but couldn't find anything straight away.

What I do now is:
- run `live-server` in output folder
- map keybinding in vim to trigger `stack run` to build website
- see content reload in browser (thanks to live-server)

But ideally, I would like to do this directly in slick with something like a `--watch` or `--continuous` flag.

Start by tracing the existing `stack run` build path and how Shake is configured, then compare it with the current `live-server` workflow. Define the expected behavior for a `--watch` or `--continuous` option and verify that content changes rebuild the output and refresh the browser.

Written by the indexing model from the issue text.