[BB-3869] Update Hero page

Created by: arjunsinghy96

Updates hero page to conform to the new UI

Related Tickets BB-3869 Gitlab#721

Testing Instructions

1. Checkout to this branch
2. Visit http://localhost:3000/console/theming/hero
3. Verify that the UI looks correct and matches this mock
4. Verify that all the components from old Hero page are moved to sidebar.
5. Verify that updating values in sidebar gets reflected in BetaTestApplication

Screenshots Hero Edit screen