Repo was transferred UOM -> RunicGateway. build-images.yml already
derives its registry owner from github.repository_owner, so it now
publishes to gitea.whitlocktech.com/runicgateway/*, but docker-compose
still pulled from /uom/*. Point the app+bot images at the new owner so
deploys pull the images CI actually publishes. Also update the two
README links to the uo-link repo (UOM/link -> RunicGateway/link).
No branding text touched (that is handled separately).
