message: cp: hamburger splattributes
diff: -<button type="button" class="hamburger-menu__trigger" disabled={{@open}} {{on "click" (optional @onOpen)}} >
  +<button
  + type="button"
  + class="hamburger-menu__trigger"
  + disabled={{@open}}
  + {{on "click" (optional @onOpen)}}
  + ...attributes
  +>
  {{svg-jar "hamburger-menu" width="20" height="14"}}
  </button>
  