Geo: have separate installation instructions for Omnibus and for installation from source
Description
The current installation documentation for Geo contains instructions to install for both Omnibus and from source. During the installation with Omnibus, I made multiple times the error to enter instructions that were destined for the source installation. It's not that it wasn't well mentioned or explained - it's because you don't read everything when you want to move forward quickly.
To avoid confusion, we should simply split the documentation in two: one for Omnibus installs, the other for installs from source.