Remove Vanilla 3 changes from "What's new" page

[bartaz]

Done

Removes Vanilla 3 changelog from "What's new" page and moves it to separate changelog page.

QA

• Open demo
• Make sure what's new page only lists changes from Vanilla 4: https://vanilla-framework-4851.demos.haus/docs/whats-new
• Check if new v3 page lists all changes from Vanilla 3: https://vanilla-framework-4851.demos.haus/docs/changelog-v3

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

[if relevant, include a screenshot or screen capture]

[webteam-app]

Demo starting at https://vanilla-framework-4851.demos.haus

[ClementChaumel]

Well done 👌️