Commenting out the reset in dist

The reset isn’t in the dist folder an dits being pulled in (I think) in
dist/_scut.scss anyway
Scut Border mixin

* Adding the Scut Border mixin
* Follows the same pattern and functionality as the other box-model
mixins
Adding a test example
Updating the docs with the Scut Border mixin

Basically copying the padding docs but for borders.