General improvements to the site; canonicalized redirects, added aria support, better image handling, JPEG-XL support, inlining critical JS, deferred non-critical JS, user's default theme preference taken into account.

Improved the articles page to have better style, sticky headings, anchor link support, better word counting, reading time estimates.

Updated cache busting to use file hashes instead of modified times (that felt cleaner to me).

Fixed a bug where cached content was not properly marked as immutable in the response header.

Added proper support for article tags (with a tags page to view similar articles).

Started writing the next article I plan on publishing (not finished yet).