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

Add last modified time variable (eg. $p->lastMod). Add fallback just in case the tags count not the same.

Publish a post with future date or time, it will go into scheduled posts.

Remove deprecated warning for PHP 8.x

Fix #570 570 Translation missing
tks to @bttrx

Switch using category for better performance and consistency

Allowing to set the tagcloud number