feat: export variables.scss as a plain scss file for import

[hoorayimhelping]

Changes

Exports ours variables.scss file as a plain scss file so anything that depends on clockface can access its variables.

this would allow us to do something like the following in Influxdb or giraffe

@import "reset";
@import "@influxdata/clockface/dist/variables.scss";
@import "mixins";

Checklist

Check all that apply

• Updated documentation to reflect changes
• Added entry to top of Changelog with link to PR (not issue)
• Tests pass

[mavarius]

omg yes!

[alexpaxton]

Wow so little code for such big impact

[alexpaxton]

@hoorayimhelping just throw an entry in the changelog and you're good! Might have to add a header for the newest version if there isn't one