Teach hugo to listen over TLS without a port appended

Add targets to documentation & website, to serve the website over TLS,
with nice clean URLs. You will need to provide the TLS terminating proxy
yourself.

Differential Revision: https://reviews.freebsd.org/D53930

Approved by: ziaee
Reviewed by: kevans
Event: BSDCan 2026
Sponsored by: SkunkWerks, GmbH