Update links to use new theming

[bartaz]

Done

Updated links (and link related components) to use new theming.

Fixes WD-8894

QA

• Open demo
• Check links examples, make sure they update as expected when body class is changed (is-paper is-dark):
  • https://vanilla-framework-4997.demos.haus/docs/examples/base/links
  • https://vanilla-framework-4997.demos.haus/docs/examples/patterns/links/links-dark
  • https://vanilla-framework-4997.demos.haus/docs/examples/patterns/links/links-soft
  • https://vanilla-framework-4997.demos.haus/docs/examples/patterns/links/links-back-to-top
• Review updated documentation:
  • https://vanilla-framework-4997.demos.haus/docs/patterns/links

Check if PR is ready for release

If this PR contains Vanilla SCSS code changes, it should contain the following changes to make sure it's ready for the release:

• PR should have one of the following labels to automatically categorise it in release notes:
  • Feature 🎁, Breaking Change 💣, Bug 🐛, Documentation 📝, Maintenance 🔨.
• Vanilla version in package.json should be updated relative to the most recent release, following semver convention:
  • if CSS class names are not changed it can be bugfix relesase (x.x.X)
  • if CSS class names are changed/added/removed it should be minor version (x.X.0)
  • see the wiki for more details
• Any changes to component class names (new patterns, variants, removed or added features) should be listed on the what's new page.

Screenshots

[webteam-app]

Demo starting at https://vanilla-framework-4997.demos.haus

[britneywwc]

Looks great!

[chillkang]

LGTM 👍