Make the installation page the simpliest looking most non-scary page ever

[ianlandsman]

https://support.helpspot.com/index.php?pg=kb.page&id=501

Just windows use installer, Linux use shell.

We have multiple other requirements page so we should link to those rather than have the reqs in here.

Some kind of link to the 'full manual installation' which goes through all the other stuff

[fideloper]

🍻