message: replace missed teespring link with dbh link
diff: <li class="mobile-heading"><img class="logo link release" src="images/DIM-menu.svg" alt="DIM" href="#"></li>
  <li><a target="_blank" href="https://opencollective.com/dim?utm_campaign=dim&utm_medium=github&utm_source=opencollective#about_us">About</a></li>
  <li><a target="_blank" href="https://opencollective.com/dim?utm_campaign=dim&utm_medium=github&utm_source=opencollective#support">Backers</a></li>
  - <li><a target="_blank" href="https://teespring.com/stores/dim">Shop</a></li>
  + <li><a target="_blank" href="https://www.designbyhumans.com/shop/DestinyItemManager/">Shop</a></li>
  <li><a target="_blank" href="https://github.com/DestinyItemManager/DIM/issues">Support</a></li>
  <li><a href="https://app.destinyitemmanager.com">Launch App</a></li>
  </ul>
  