Updated markup and less for latest changes in CF

[jimmynotjim]

Updated to account for the latest changes to cf-core and cf-icons.

Changes

• Updated all webfont mixin references to use font-weight property.
• Updated all cf-icon references to use inline svgs

Testing

• Follow the directions to stand up a new project
• Run npm start in that project and navigate to the temp page, ensure the type is correctly set and the icons are correctly displayed.

Screenshots

Checklist

• [x] Changes are limited to a single goal (no scope creep)
• [x] Code can be automatically merged (no conflicts)
• [x] Code follows the standards laid out in the front end playbook
• [x] Passes all existing automated tests
• [x] New functions include new tests
• [x] New functions are documented (with a description, list of inputs, and expected output)
• [x] Placeholder code is flagged
• [x] Visually tested in supported browsers and devices
• [x] Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)