Feature Request: Completely portable site with no base_url used in any links

[JoshOrndorff]

I would like to build a site where every internal link is relative, including links to css, js, and other static assets.

This has many concrete usecases:

• Publishing on IPFS where a user may use any arbitrary URL that happens to have an IPFS node running.
• Serving the main site on a web server and keeping a mirror on Github Pages
• Accessing the site via IP address when DNS hasn’t updated or is otherwise slow, broken, or inconvenient.
• Host my site at my main URL, but also at my legacy URL that some people might still have bookmarked.
• No longer need to use --base_url http://0.0.0.0:8000 when building for local testing.

I see this is asked for in the forum over the years also:
https://zola.discourse.group/t/using-for-base-url-doesnt-work-properly/2348
https://zola.discourse.group/t/leaving-base-url-empty/1585

[JoshOrndorff]

IPFS documentation gives examples of publishing sites with several static generators. https://docs.ipfs.tech/how-to/websites-on-ipfs/static-site-generators/

This led me to discover Hugo's relativeURLs reature and Middleman's relative_links. This is exactly what I'm asking for in Zola.

Incidentally, those IPFS docs also mention a tool called all-relative that seems to convert sites created by VeuPress or Jekyll to have relative links. I hoped it might work for my zola site, but it doesn't.