chore: remove 'Source' section

src/provider-map.html

@@ -125,18 +125,4 @@ <h2 class="mt-0">Data dictionary</h2>
       {% endfor %}
     </ul>
   </article>
-
-  <article class="mt-5 mb-5">
-    <header>
-      <h2 class="mt-0">Source</h2>
-    </header>
-    <div>
-      <p class="mb-0">
-        This list was created in April 2019 by consultant Trillium Transit under contract to Cal-ITP. It was compiled from a
-        variety of sources, including Trillium contacts, California State Controller’s State Transit Assistance (STA) summary,
-        American Public Transportation Association (APTA) database, California Transit Association members, and the National
-        Transit Database (NTD).
-      </p>
-    </div>
-  </article>
 </div>