Add a set of E2E tests to verify functionality

[dkundel]

During a stream we found Nixt. It might be a good tool to implement some E2E tests for the various commands.

We should probably have them in a dedicated folder e2e that contains one file for each command. I think it also makes sense to combine it with nock using a combination of Nock Back and disallowing any network connections

[dkundel]

This could be useful to verify project scaffolding functionality
https://twitter.com/threepointone/status/1302691677749075970?s=21