If there is functions.php inside themes root, include it.

If username has underscore

Change it in bulk using simple php code

site.url not set will similar to multi.site true

If you upload an image on one of the sites, change the image address to relative path.

The username.ini and category files not mandatory anymore.

Add new feed URL, adding /feed to category, tag, type, search, author. Eg. /category/htmly/feed

Far more easier to remember

It's easier to understand more optimal for managing static pages.

Properly handle if missing title tag when write offline. The title eg. `Untitled post: Sunday, 17 December 2023, 18:53`

$_SERVER['REQUEST_URI'] is always url-encoded so we decoded it back before save it as a cache file.

Allows us to reuse previous uploaded images.
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Add SECURITY.md also fix unexpected behavior with tags in number. See #614