Update homepage

[bethcollins92]

Done

• Update Sketch box to include mentioning Vanilla version compatible
• Update quickstart section

Fixes #4214

QA

• Open demo
• Check the homepage sketch card and quickstart section

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.
• Documentation side navigation should be updated with the relevant labels.

[webteam-app]

Demo starting at https://vanilla-framework-4216.demos.haus

[bartaz]

I think we have broken this image when removed blazy (there is an image on the right):

would be good to search the project for any blazy references

[bethcollins92]

@bartaz waa didn't spot the images disappearing! Christmas brain. I've replaced all the blazy references now and updated the text

[bartaz]

LGTM, thanks!