Update links for Fastmail
Update links for Fastmail

Currently linked 2FA doc is 404, TLD has changed.
Jawshy/twofactorauth,jdavis/twofactorauth,baileybasiscode/twofactorauth,stephengroat/twofactorauth,rj175/twofactorauth,jtamplin/twofactorauth,ahelpingchip/twofactorauth,bceasydns/twofactorauth,NormandLemay/twofactorauth,RichJeanes/twofactorauth,seitsu/twofactorauth,vgarmash/twofactorauth,bjorno/twofactorauth,ahelpingchip/twofactorauth,Nitrokey/dongleauth,bceasydns/twofactorauth,rugk/twofactorauth,stephengroat/twofactorauth,jtamplin/twofactorauth,Jawshy/twofactorauth,Jawshy/twofactorauth,NormandLemay/twofactorauth,cez81/twofactorauth,cez81/twofactorauth,vgarmash/twofactorauth,bceasydns/twofactorauth,rj175/twofactorauth,Nitrokey/dongleauth,jdavis/twofactorauth,brierjon/twofactorauth,RichJeanes/twofactorauth,Nitrokey/dongleauth,bjorno/twofactorauth,RichJeanes/twofactorauth,baileybasiscode/twofactorauth,vgarmash/twofactorauth,NormandLemay/twofactorauth,baileybasiscode/twofactorauth,brierjon/twofactorauth,Criminalllz/twofactorauth,seitsu/twofactorauth,gingerbeardman/twofactorauth,gingerbeardman/twofactorauth,rugk/twofactorauth,cez81/twofactorauth,bjorno/twofactorauth,jtamplin/twofactorauth,rj175/twofactorauth,stephengroat/twofactorauth,jdavis/twofactorauth,Jawshy/twofactorauth,ahelpingchip/twofactorauth,Criminalllz/twofactorauth,Criminalllz/twofactorauth,seitsu/twofactorauth,brierjon/twofactorauth,gingerbeardman/twofactorauth,rugk/twofactorauth