Added Open Collective link to footer

_includes/footer.html

@@ -37,7 +37,8 @@
 
       <div class="footer-col footer-col-3">
         <p style="text-align:right;">{{ site.description }}</p>
-        <p style="text-align:right;">Help improve CommunityRule by <br />posting an <a href="https://gitlab.com/medlabboulder/communityrule/-/issues">Issue</a> or <a href="https://gitlab.com/medlabboulder/communityrule">editing the source directly</a></p>
+        <p style="text-align:right;">Help improve CommunityRule by <br />posting an <a href="https://gitlab.com/medlabboulder/communityrule/-/issues">Issue</a> or <a href="https://gitlab.com/medlabboulder/communityrule">editing the source directly</a>,<br />
+        or donate <a href="https://opencollective.com/communityrule">on Open Collective"</a></p>
         <p style="text-align:right;"><a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" /></a></p>
       </div>
     </div>