Consider reminding folks to install

[cfjedimaster]

This may seem a bit dumb, but coming from here, https://docs.nativescript.org/sidekick/intro/introduction, the first real link is under Get Started. I'd maybe add a reminder on this page, in the main body text, to tell people they need to actually install it first. Again, probably kind of dumb, but when I first got here I thought I could go into "Get Started" and not worry about installing first. I had seen a web-based version of this (I think?) at a conference so I thought maybe it would go there.