Mk docfixes 5

...such as juliapackages.com

documenter pls

postpone the external triggers

reorganize the CI, add a bit of documentation

docfixes

closes #498

closes #497

closes #499

(this is different from `devbranch`)

develop→master

Polish the notebook/example sections

Fix the documentation and some small issues 

Make the GRR parser a bit more robust

Fix contribution docs

Closes #490