[landing] introduce Matrix competitor data

Summary:
introduce matrix competitor data. The copy was copied and pasted from this linear task.

Spoke to @ashoat IRL and we came to the conclusion that is was fine for the copy of the encryption card to have more than 3 lines

Depends on D8031

Test Plan:
Please see the screenshots below:

Cards:

Modal:
Single paragraph example

multi paragraph example

scroll example

Reviewers: atul, kamil

Reviewed By: kamil

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D8030