Starterkits replaced with a single generic starterkit and styles moved to separate project

This is now a completely separate repository for all permutations of Drupal Bootstrap styles:

https://github.com/unicorn-fail/drupal-bootstrap-styles

As a result of these styles being moved, there is now only a single THEMENAME generic starterkit available. You will also notice the automation tooling used (grunt) to maintain these files have also been removed. A delightful side-effect of this change is that the packaged codebase filesize has decreased dramatically.

Sub-theming documentation for both branches have been updated accordingly:

Sub-Theming (8.x-3.x)
Sub-Theming (7.x-3.x)