The wiki moved from infra to services

The wiki is something running on our server, not part of the server
environment itself, so `wiki-pages` belongs in `services` by the org
taxonomy. Transferred on the forge, and the workspace folder and the
remote followed. Gitea's redirect keeps the old `infra/wiki-pages`
paths resolving, so the deployed checkout and existing links still
work.

The clone list, the wiki file paths in the table and the folder tree
in the README follow.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

README.md

@@ -68,8 +68,8 @@ TTG/
 ├── demos/          # one per engine: shows a platform, not a product
 ├── engines/        # own engines and libraries other repos depend on
 ├── games/          # catalog products
-├── infra/          # the server environment itself (nginx, backups, wiki-pages)
-├── services/       # what runs on our server (public site, bots)
+├── infra/          # the server environment itself (nginx, backups)
+├── services/       # what runs on our server (public site, wiki, bots)
 ├── stores/         # store engines and the stores built on them
 ├── tools/          # what one person installs and runs for themselves
 ├── media/          # reference images and documents — not git repos