tutorial for GitLab pages

Merged Bernd Taschler requested to merge ndcn1032/Open-WIN-Community:gitlab-pages into master

Additional gitlab tutorial on how to create a GitLab Pages site, using WIN's Jekyll-based templates.

(It doesn't look very pretty at the moment, i.e. maybe some images/gifs/etc. needed, but should contain all necessary steps to deploy a site.)

See #38 (closed).

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