[landing] introduce competitor feature card component

Summary:
This diff introduces the CompetitorFeatureCard that will be used in the competitor comparison section of the landing page.

Here are what the cards look like in the Figma:

Depends on D8016

Test Plan:
Please see the following screenshots/demos below:

Please not the focus on this diff is just the cards itself, the container for the cards will be cleaned up in a subsequent diff

Desktop/Bigger device view:

Hover effect:

Mobile view:

Reviewers: atul, kamil

Reviewed By: atul

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D7905