fix(hero): 50/50 with no image is laid out in split columns

[jmuzina]

Done

• Adjusts the hero pattern to split its left and right columns when layout="50/50" and no image is provided.
• Drive-by: removes docs section new/updated status labels for changes that were made several months ago.

No API changes have been made.

Fixes #5449
Fixes WD-18357

QA

• Open example and verify it appears as expected.
• Review updated Hero docs
• Review 4.20.1 release notes

Check if PR is ready for release

If this PR contains Vanilla SCSS or macro 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 existing APIs (CSS classes & macro APIs) are not changed it can be a bugfix release (x.x.X)
  • if existing APIs (CSS classes & macro APIs) are changed/added/removed it should be a minor version (x.X.0)
  • see the wiki for more details
• Any changes to component class names (new patterns, variants, removed or added features) or macros should be listed on the what's new page.

Screenshots

[webteam-app]

Demo

Jenkins

demos.haus

[mtruj013]

LGTM, thanks for this @jmuzina !