Support running behind Bunny CDN

[clue]

Refs https://github.com/clue-engineering/justkanban/issues/157 (internal) and clue/framework-x-website#36

[clue]

Done

Most important settings:

• Bunny DNS with CDN acceleration enabled
• Validate origin certificate
• Add custom domains for redirects
• Custom edge rule to redirect to main domain
• Disable smart cache (Improve caching for static assets (simple cache busting) #93)
• Enable stale cache while origin is offline
• Await DNS propagation and confirm + integration tests + check domains

Global benchmark looks good 👌