In this push, we are making a decent amount of updates to the gitlab
playbooks as well as updating the README. See below for the changes:
* README updated for further clarity
* GitLab role with further reconfiguration for group lookups
* GitLab role with further reconfiguration to disable built-in nginx
* nginx configuration added and provided to work with omnibus
* GitLab variables updated
moved inv vars to group vars
moved roles to collections and fixed playbooks
added a prepare ansible host playbook to download needed roles and playbooks
modified public roles and collection paths to install inside our dir structure to keep them from global installation
