Gentoo English Installation Guide

I have created an installation guide for getting Pleroma up and running on Our Dark Lady's one true GNU/Linux distribution, Gentoo. Funroll your loops and check it out! I used the Arch install guide as a template, which I went through and changed line by line to work for Gentoo, as well as adding some additional topics specific to Gentoo and some strong advice to clone your own fork of Pleroma as both my experience and that of many, many people I have talked to very much regret not doing that when they installed their Pleroma or Mastodon instance.