message: add clippy lint list to Rust dropdown menu
diff: text="The Cargo Guide",
  target="_blank"
  ) }}
  +
  + {{ macros::menu_link(
  + href="https://doc.rust-lang.org/nightly/clippy",
  + text="Clippy Documentation",
  + target="_blank"
  + ) }}
  </ul>
  </li>
  </ul>
  