Relative URLs for external links

[markwebsterUK]

Description

When accessing the dashboard remotely (via TailScale, for example), the external URLs for services will often be different to when you're accessing from the local network. It would be good to be able to set base URLs for internal and external access, so the external URL setting could look something like [base_url]:9000

Priority

Low (Nice-to-have)

[github-actions]

Hello 👋, this issue has been open for 60 without activity. Please close this issue if it's no longer relevant or has been resolved. Still relevant? Simply reply and I'll mark it as active.

[manuel-rw]

Closing as duplicate of #1604 and #1089