Update dead links and e-mails our sources

Update dead links and e-mails our sources

http://www.openssl.org/~appro/cryptogams/ is 404, update to
https://github.com/dot-asm/cryptogams/

And clean up the boiler plate text around it.

Replace stray usage of appro@openssl.org with github url. The email in
question here is no longer valid, replace it with the corresponding
github id for the user.

Replace <appro\@fy.chalmers.se> with <https://github.com/dot-asm>

Fix lots more dead emails addresses that we missed

Remove reference urls that no longer exist. Just delete urls that
404 now, and have no obvious new link.

Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Paul Yang <kaishen.yy@antfin.com>
(Merged from https://github.com/openssl/openssl/pull/27073)