Add admin link to notes

[garethrees]

<aside class="authority__header__notes" id="notes">
  <article id="note_1" class="note">
    <h1>
      title
    </h1>A note
    <p class="event_actions">
      <a href="/admin/notes/1/edit">Admin</a>
    </p>
  </article>
  <article id="note_4" class="note">
    Another note!
    <p class="event_actions">
      <a href="/admin/notes/4/edit">Admin</a>
    </p>
  </article>
  <article id="note_5" class="note tag-foo">
    A foo-ey note
    <p class="event_actions">
      <a href="/admin/notes/5/edit">Admin</a>
    </p>
  </article>
</aside>