Add HTTPS/TLS support to documentation

[djat]

Provide documentation for the https/tls support in DefraDB. This options are available from the "start" command.

  --tls                         Enable serving the API over https
  --privkeypath string          Path to the private key for tls (default "/Users/o/.defradb/certs/server.crt")
  --pubkeypath string           Path to the public key for tls (default "/Users/o/.defradb/certs/server.key")
  --email string                Email address used by the CA for notifications (default "example@example.com")