Switch to pure JS sass to get rid of node-sass

[jfarseneau-wb]

Summary

Node-sass is a huge pain with compilation, this plays better with other tools and uses pure JS

It also adds source-maps to the CSS for debuggery

Submitter Checklist:

• Perform self-review (see reviewer checklist)
• Address reviewer feedback, if any, and assign back to reviewer

Reviewer Checklist:

• Version bump in package.json
• Visually review significant UI changes
• Assign @pez-wb as reviewer if needed
• Assign back to submitter with feedback

[pez-work]

Tested w/ WB, PSD, & Valet all appear to work as expected

[jfarseneau-wb]

Thanks for the review @pez-wb !