[navigation-next]feat: add description field in App.

[SuZhou-Joe]

Description

In new overview page, we are showing description of each feature, in that case, we need to add a field description so that plugins can give the description for their features.

Issues Resolved

Screenshot

No UI changes

Testing the changes

Only field change.

Changelog

• feat: add description field in App.

Check List

• [x] All tests pass
  • [x] yarn test:jest
  • [x] yarn test:jest_integration
• [x] New functionality includes testing.
• [x] New functionality has been documented.
• [x] Update CHANGELOG.md
• [x] Commits are signed per the DCO using --signoff