Merge pull request 'Add "financial" mail :)' (#2) from make_hedgedoc_main into master

Reviewed-on: Aurore/site-aurore#2
Reviewed-by: otthorn <otthorn@noreply@auro.re>

templates/contact.html

@@ -8,6 +8,8 @@
 <a href="mailto:events.aurore@lists.crans.org">Organisation d'évenements</a>
 </p><p>
 <a href="mailto:support.aurore@lists.crans.org">Support technique</a>
+</p><p>
+<a href="mailto:tresorerie.aurore@lists.crans.org">Trésorerie</a>
 </p>