replace "snapdrop" with "pairdrop" and change links accordingly + add changes to faq and readme

docker/openssl/snapdropCert.cnf

@@ -9,7 +9,7 @@ string_mask         = utf8only
 prompt              = no
 
 [ subject ]
-organizationName    = Snapdrop
+organizationName    = Pairdrop
 OU                  = Development
 
 # Use a friendly name here because it's presented to the user. The server's DNS
@@ -26,4 +26,4 @@ basicConstraints     = CA:FALSE
 keyUsage             = digitalSignature, keyEncipherment
 subjectAltName       = DNS:${ENV::FQDN}
 nsComment            = "OpenSSL Generated Certificate"
-extendedKeyUsage     = serverAuth
+extendedKeyUsage     = serverAuth