feat: allow users to control their sendgrid unsubscribe settings#526

kueda wants to merge 3 commits intomaininaturalist/iNaturalistAPI:mainfrom

web-391-allow-users-to-control-their-sendgrid-unsubscribe-settingsinaturalist/iNaturalistAPI:web-391-allow-users-to-control-their-sendgrid-unsubscribe-settingsCopy head branch name to clipboard