Start deployment work for Drupal CMS.

Still a draft until

• content-ui has a CI job to actually produce artifacts, including theme
• Composer-based rollout of content-ui artifacts
• Refresh deployment keeping the existing database
• Integration of search-ui artifacts based on the Docker deployment Happens upstream in content-ui project.
• backup/restore scripts of database and uploaded files

Necessary follow-ups

• Make either the theme compatible with our CSP or make targeted adjustments to the CSP itself
• Fix database traffic by disabling anything that writes to the DB for content views
• Fix security-related issues on trusted hosts and webforms private file system
• Fix loading fonts and JS libraries via CDN and ship them ourselves instead
• Deploy usage-stats-api and integrate its JS snippet into the theme