revert to using icon labels instead of hardcoding icons in the compose files.

docker-templates/gitea/docker-compose.yml

@@ -29,7 +29,7 @@ services:
     depends_on:
       - gitea-db
     labels:
-      - ${ICON_LABEL}
+      - com.getarcaneapp.arcane.icon=https://cdn.jsdelivr.net/gh/selfhst/icons@main/svg/gitea.svg
       - ${HOST_LABEL}
       - ${LOADBALANCER_LABEL}
       - ${WATCHTOWER_ENABLE_LABEL}
@@ -55,7 +55,7 @@ services:
       - POSTGRES_PASSWORD=${GITEA_DB_PASSWORD}
       - POSTGRES_DB=gitea
     labels:
-      - ${DB_ICON_LABEL}
+      - com.getarcaneapp.arcane.icon=https://cdn.jsdelivr.net/gh/selfhst/icons@main/svg/postgresql.svg
       - 'homelab.category=productivity'
       - 'homelab.description=Gitea database'