Update division signs

[tksheppard]

Related to Issue

Fixes #299

Description

This adds the scss math function which changes the use of division signs to instead use math.div. This will get rid of deprecation warnings.

How Has This Been Tested?

Changed and compiled.

Screenshots (if appropriate):

Types of changes

• [ x ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [ x ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

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[tksheppard]

Wasn't aware calc() allowed for that. Was going off the recommendation made in the console, which I stopped reading after math.div. I like calc() much more, and removes the usage of scss:math. So, I changed over to use calc().