[magazine] Dropping the in subject

Can we drop this tag on all list emails? All clients offer ways to filter email from lists. In some readers, this tag makes it harder to read the actual subject line to tell what the message is about. IIRC common Fedora netiquette is to not use this tag.

By the way, you can use the header List-Id to filter easily. You can use the term "list:magazine@lists.fedoraproject.org" in Gmail's filters as well. Most other web based email UIs have similar functions.