404 - This host is not configured

Custom 404 error page for KajKowalski Edge.

A storm-themed page that displays "404 - This host is not configured" when a visitor reaches an unconfigured hostname.
The page dynamically inserts the current hostname, features animated lightning bolts over a dark atmospheric background, and automatically activates a calm mode for users who prefer reduced motion.

- run: curl -fsSLo dist/404.html https://esm.sh/@kjanat/404-page/index.html

or use the composite action (writes 404.html into directory):

- uses: kjanat/404@master
  with: { directory: dist/site }

The action bakes in mode: path by default, so the page reads as "this link is broken, the site is fine" with climb-up links — the right voice for Pages, where a 404 means the path is missing, not the whole host. Set mode: domain for an unconfigured-host page, or mode: auto to detect at runtime instead.

- uses: kjanat/404@master
  with: { directory: dist/site, mode: auto }

Note that mode: auto is weaker than the default on Pages: runtime detection only upgrades to the path voice when it can prove the site is live — a same-host referrer or a *.github.io host. A direct hit on a custom Pages domain (or traffic arriving from another site) falls back to domain voice, which is why path is baked in by default.