quick start guide for w3up

[heyjay44]

We are going to make this quick start more substantial than the previous versions.

• P1: w3cli

[yusefnapora]

i've been working on this in #2095 - you have to manually nav to /docs/v2 to see the new quickstart

[yusefnapora]

closing this one & turning it into a checkbox on #2190