Kestrel's Hall moves into the kit and onto the shared host

The landing page was a static page in the blog, served by the Yunohost
box through an nginx drop-in and an SSOwat rule. It now lives in
gamehall/site beside family.json, is served by Caddy on the shared host
with the games (gamehall/gamehall.caddy), and publishes with
gamehall/deploy.sh. Its share image is its own, not the blog's.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jm2auWk6RP71CjaAb4FMoG

gamehall/site/favicon.svg

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