Update `frontend-app-account` to use Design Tokens

[brian-smith-tcril]

### Tasks
- [ ] Create draft PR updating MFE to use Design tokens
- [ ] Ensure draft PR is using released versions of `paragon`/`frontend-build`/`frontend-platform` from `npm`
- [ ] Set up sandbox to test draft PR
- [ ] Get draft PR approved
- [ ] Create new `master-design-tokens` branch off of latest `master`
- [ ] Update PR to point to `master-design-tokens`, move out of draft
- [ ] Merge PR

[github-actions]

Thanks for your submission, @openedx/openedx-product-managers will review shortly.

[dcoa]

It has been worked openedx/frontend-app-account#1198