Support pages build from branches

[rob-metalinkage]

See action run on branch

https://github.com/rob-metalinkage/bblocks-skos/actions/runs/14505605887/job/40694394072

Is it possible to configure this to build branches to some reviewable location without breaking master branch view?

If not, it means there is a process to review PR which needs to be documented - checkout the branch to review and run build and viewer locally.

[rob-metalinkage]

draft script here - https://gist.github.com/avillar/0c3a40a89fe3dacea598815d1fe445d8

Needs documented instructions.