Correct the registry namespace to the Docker org

The previous commit moved the images to honey/, which was wrong: the
images have lived under the Docker organisation since February, alongside
learning-tracker and whopays, and are linked to this repository there.
Only the placeholder 'marc' was never real.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

build.sh

@@ -2,7 +2,7 @@
 set -e
 
 REGISTRY="gitea.honeyy.duckdns.org"
-OWNER="${GITEA_OWNER:-honey}"
+OWNER="${GITEA_OWNER:-docker}"
 TAG="${1:-latest}"
 
 FRONTEND_IMAGE="${REGISTRY}/${OWNER}/inknote-web:${TAG}"