Listen to resize events and check revealed

[kulik0v]

Description

It is possible that element can be revealed not only because of scroll but because window size is changed or other elements in a page dynamically changed.

Corresponding issue:

Testing

1. Load test page in small window with test element (activated by hx-trigger="revealed") below visible area.
2. Resize the window.
3. When test element is visible revealed event is missing.

Checklist

• [yep] I have read the contribution guidelines
• [dev] I have targeted this PR against the correct branch (master for website changes, dev for
  source changes)
• [fix] This is either a bugfix, a documentation update, or a new feature that has been explicitly
  approved via an issue
• I ran the test suite locally (npm run test) and verified that it succeeded

[alexpetros]

This looks good

[1cg]

great fix!