Remove reference to the extension page from the footer

Created by: philipp-spiess

I didn't even know we had this real estate for us, wow.

Anyway just an addition to the prior PRs that hide links to the extension page when enableLegacyExtensions is false.

Test plan

App preview:

• Web
• Storybook

Check out the client app preview documentation to learn more.

Created by: taras-yemets

Review: Approved

Merged by: philipp-spiess at 2022-08-12 14:03:46 UTC