README.platform has general platform-specific information, having it
following text about FIDO2 on the same line could imply that it only
has information about FIDO2.
Clarify the text about the implications of building without OpenSSL, and
prefix the "configure --help" example command with a "./" so it's likely
to work as-is in more shells. From bz#3461.
A number of contrib/* files refer to the existing README so let's leave
it in place for release and add the new markdown version in parallel.
I'll get rid of README after release.
Darren Tucker
Jeffrey H. Johnson
Damien Miller
Ruben Kerkhof
Abhishek Arya