[landing] address keyserver copy on the main page touchups

Summary:
resolves the following keyserver copy on the main page touchup:

https://linear.app/comm/issue/ENG-4623/keyserver-copy-on-the-main-page

Depends on D8782

Test Plan:
Please see the screenshot:

Reviewers: atul, kamil, ashoat

Reviewed By: ashoat

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8783