[documentation] Add link to GitLab Pages template
I'm submitting a ...
What is the current behaviour?
There are some Jekyll templates for creating GitLab Pages sites, but they are only accessible if you know to look for them.
What is the expected/preferred behaviour?
What is the motivation / use case for changing the behaviour?
Improves accessibility and knowledge sharing
Be sure to include details on how to give feedback on the templates, i.e. as issues of MRs on the template repos themselves.