Add some e2e CI

[dmadisetti]

overleaf provides some docker containers. With 5547262 I was able to test that airlatex works with these containers.

TrackChanges works, but comments do not since they require a totally difference service. No clear way of turning this one, but could still do tests for:

interaction:

• [ ] - connect to project
• [ ] - disconnect from project
• [ ] - open up multiple files

Mutation

• [ ] - addition
• [ ] - remove
• [ ] - replace lines
• [ ] - w/ track changes

[dmadisetti]

Ideally, make a dump of the redis and mongo data as baseline. See if we can get a session token or inject one in