Redo Command Line and Github TA demos using Docker

[nathan-duddles]

We currently have multiple resources for Git and Github, some mentioning/using Vagrant.

In Week 1:

Code Version Control - this is Boon's lecture and is high level and no mention of Vagrant. Definitely keep this.

TA Demo: Project 0 Git - this one explicitly uses Vagrant.

TA Demo: Command Line - this also explicitly uses Vagrant.

Best to replace the above with a newly demo or demos before Spring 2022.

In Resources:

Introduction to GIT

• A useful guide to GIT. Would it be worth keeping/ moving this to Week 1, and group it together with other Version Control related content?

[boonloo]

Ideally, we should redo the demos without vagrant. But it is also fine to keep them, and then tell students to focus on the Git and command line, and not Vagrant.

[nathan-duddles]

I created tutorials for set up and posted for Spring 22 Coursera here, here and here.

Adding a pop up text note about using $(pwd) and not `pwd` on Windows to the first demo video.