Add linux install instructions doc
Add linux install instructions doc

We'll adjust or add to these when we can use apt-get/yum/zypper with
signed packages.

Right now there are only 2 different packages, a single .deb and a
single .rpm but we separate it per distro in case we need changes later.

Auditors: da39a3ee5e6b4b0d3255bfef95601890afd80709@diracdeltas

jonathansampson/browser-laptop,pmkary/braver,pmkary/braver,dcposch/browser-laptop,MKuenzi/browser-laptop,darkdh/browser-laptop,manninglucas/browser-laptop,timborden/browser-laptop,luixxiul/browser-laptop,jonathansampson/browser-laptop,diasdavid/browser-laptop,diasdavid/browser-laptop,jonathansampson/browser-laptop,darkdh/browser-laptop,diasdavid/browser-laptop,darkdh/browser-laptop,diasdavid/browser-laptop,manninglucas/browser-laptop,Sh1d0w/browser-laptop,jonathansampson/browser-laptop,MKuenzi/browser-laptop,Sh1d0w/browser-laptop,manninglucas/browser-laptop,pmkary/braver,MKuenzi/browser-laptop,timborden/browser-laptop,willy-b/browser-laptop,MKuenzi/browser-laptop,luixxiul/browser-laptop,darkdh/browser-laptop,manninglucas/browser-laptop,Sh1d0w/browser-laptop,dcposch/browser-laptop,willy-b/browser-laptop,timborden/browser-laptop,dcposch/browser-laptop,Sh1d0w/browser-laptop,dcposch/browser-laptop,luixxiul/browser-laptop,willy-b/browser-laptop,luixxiul/browser-laptop,willy-b/browser-laptop,pmkary/braver,timborden/browser-laptop