update .env on production with postmark settings #ctr

ask Postmark for high volume pricing #nomads #remoteok #photoai #interiorai

fix #remoteok make discount codes because didn't switch it to Postmark so switch it

Add postmark gem, config and a RebrandMailer for trying first broadcast via postmark #highscoredomains

move #interiorai fully to Postmark from SendGrid

move #photoai fully to Postmark from SendGrid