v6.0 remove "Old" configuration

v6.0 remove "Old" configuration

• remove "Old" configuration; "Old" configuration is not recommended
  For those who need to reference older guidance, older versions of
  the ssl-config-generator may be obtained from the Internet Archive
  (archive.org)

https://web.archive.org/web/*/https://mozilla.github.io/server-side-tls/ssl-config-generator/