Redesign

[Teebusch]

The redesigned page is here: https://teebusch.github.io/uio-carpentry.github.io/ The source is here: https://github.com/Teebusch/uio-carpentry.github.io/tree/use_hugo

Before merging PR:

• [x] use hugo
• [x] use github actions for CI
• [x] render upcoming workshops list
• [x] import governance docs into repository
• [x] import study group content into repository (posts imported, minutes etc left in original repo - see issue in study group repo)
• [x] include reports in repo via module (editing of reports will be done in original repo)
• [x] render reports nicely
• [x] pick and adjust a theme - use 'book' theme for now. Adjust later, if desired
• [x] proof of concept: add categories, keywords and tags to content

I've moved some points into separate issues for which I think they can be discussed there and solved post-launch

[lexnederbragt]

I really like this design! If others agree, and once @Teebusch is done with the checklist (😉) I suggest we start using it!