Enable `watch` server from arbitrary host

[tymokvo]

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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?