Move git link to salsa

[Trần Ngọc Quân <vnwildman@gmail.com>]

hi,
publicity git repos are moved to salsa, so link in about page of bits
should be changed to <https://salsa.debian.org>.

$ git ls-files | xargs -n1 sed -i
's@https://anonscm.debian.org/cgit/publicity/bits.git@https://salsa.debian.org/publicity-team/bits@;s@git.debian.org@salsa.debian.org@'

Cheers,
-- 
Trần Ngọc Quân.