Add basic git (and GitLab) usage docs / how-tos
Description
We currently don't have any documentation on using git
(and its quirks) and the specifics of using git with GitLab (e.g. using Personal Access Tokens, and where to create them).
Proposal
Create a new docs
section covering these topics. GitHub covers these things nicely: https://help.github.com/
Content Ideas
N/A (yet!)