Add tooltip to delete button

src/renderer.rs

@@ -503,7 +503,7 @@ fn rm_form(rm_route: &str, encoded_path: &str) -> Markup {
  let rm_action = format!("{rm_route}?path={encoded_path}");
  html! {
  form class="rm_form" action=(rm_action) method="POST" {
- button type="submit" { "✗" }
+ button type="submit" title="Delete" { "✗" }
  }
  }
 }