Subtasks: - [ ] add [verify contact URL](https://github.com/trisacrypto/directory/blob/main/pkg/gds/emails/emails.go#L30-L31) to config - [ ] return errors instead of panic [inside of template execution](https://github.com/trisacrypto/directory/blob/main/pkg/gds/emails/emails.go#L41-L62) - [ ] [detect mimetype](https://github.com/trisacrypto/directory/blob/main/pkg/gds/emails/emails.go#L203-L221) rather than assuming zip
