Use new theme colours in base styles

[bartaz]

Done

Updates some remaining Vanilla base styles to use new themed colours.

Fixes #5025
Fixes WD-10224

QA

• Open demo
• Review examples, make sure they look fine in different themes
• Slider:
  • https://vanilla-framework-5054.demos.haus/docs/examples/base/forms/range
  • Check both in Chrome and Firefox
• Forms
  • https://vanilla-framework-5054.demos.haus/docs/examples/base/forms/labels
• Blockquote
  • https://vanilla-framework-5054.demos.haus/docs/examples/base/blockquotes

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.

[webteam-app]

Demo

Jenkins

demos.haus

[chillkang]

LGTM 🎨