Merge branch 'content_revision' into 'master'

...cumentation/accessing-the-cluster/outgoing-connections.md

...t4i/anselm-cluster-documentation/shell-and-data-access.md

docs.it4i/anselm-cluster-documentation/vpn-access.md

...ith-it4innovations/accessing-the-clusters/introduction.md

mkdocs.yml