Fixed a link to brand assets after moving page on ff.org

[jrm]

@mark_freebsdfoundation.org, something seems wrong with this review. "This is a binary file."

[mark_freebsdfoundation.org]

Weird! I did notice on the diff that vim had replaced some none printing characters with correct versions - I presume because UTF8 support now versus when the file was probably submitted in 2016? Why it’s saying it’s a binary is beyond me though. Let me try redoing it, and see if I can convince vim to ignore changing characters.

[mark_freebsdfoundation.org]

Does this look better? 8859 -> UTF8 conversion It is NOT a binary, despite
what phab thinks. cc dch

[mark_freebsdfoundation.org]

OK, it's not a binary, phab thinks it is. Discussed with @dch.