Stealing the website's viewer (#15)

* Stealing the website's viewer

* Cleaned up, diff colors

* fix test

* Clean up unused logic

* Clean up

src/components/diff/CadDiff.test.tsx

@@ -0,0 +1,10 @@
+import { render } from '@testing-library/react'
+import { CadDiff } from './CadDiff'
+
+it('renders the CAD diff element', () => {
+    render(<CadDiff />)
+
+    // TODO: find a way to add proper tests for ModelView,
+    // seems non-trivial with the simulated DOM
+    // Probably will have to go for end-to-end
+})