Machine readable site

This is related to issue #13858

Probably a better proposal would be to add upon the existing set of files.

That is to add Atom, Sitemap, and Urlset, in order to make hugo a machine-readable site.

Please read these references.

https://portal.mozz.us/gemini/woodpeckersnest.space/~schapps/journal/2025-07-29-announcing-ace.gmi

https://portal.mozz.us/gemini/woodpeckersnest.space/~schapps/journal/2025-08-10-an-analyses-of-the-benefits-of-ace.gmi