Enable `watch` server from arbitrary host

[tymokvo]

While working on a project with a new developer in a GitHub Codespace today, I wanted to be able to serve the documentation of our feature branch. However, I ran into a limitation of the watch command where dotnet tool run fsdocs watch is incompatible with a remote host because the relative links in the generated HTML are all rooted at http://localhost:8901.

Would it be possible to configure watch to:

• use an empty string for the {{root}} value in HTML templates
• serve the /tmp/watch directory
• redirect requests to paths other than [content | reference]/* to index.html

I think something as simple as dotnet tool run fsdocs watch --remote would be very convenient. Though, maybe there is already a way to accomplish this with a combination of existing flags?

[nojaf]

Ah yes, this rings a bell. Maybe adding --parameters root "" will allow for an empty root and makes things relative but I haven't tested this.

[tymokvo]

Hm, that's a start. But it seems that flag works for build but not for watch. All of the static files generated in tmp/watch are still using absolute URLs to localhost:8901.

[tymokvo]

I think I figured out a patch in #925 . But I'm a little suspicious since there was a whole branch dedicated to preventing a user override of root in watch mode.