[Handbook] Update Who Uses FreeBSD?

Remove WhatsApp
Update the Fudo Security URL
Update the GhostBSD information
Add FuryBSD and MidnightBSD

PR: 236902
Submitted by: nikolaibitinit@gmail.com
Patch by: carlavilla@
Approved by: bcr@(mentor)
Differential Revision: https://reviews.freebsd.org/D23264