Add SCSS linting

Registered by Rob Cresswell

Motivation
========
Placeholder

Description
=========

UX
===

Wireframes, Mocks, Videos and UI Markup
---------------------------------------------------------
N/A

Testing
======
As a linter, it simply needs to run and pass on all SCSS files

Outside Dependencies
==================
N/A

Requirements Update Required
========================
Update the devDependencies in our package.json

Doc Impact
=========
Update the styling dev doc to reference the new tooling

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Rob Cresswell
Direction:
Needs approval
Assignee:
Rob Cresswell
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
David Lyle

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