Add "Edit this page" link to footer.

Author: christopherthielen

_includes/footer.html

@@ -21,4 +21,10 @@
   </ul>
 </div>
 
-<div class="page__footer-copyright">&copy; {{ site.time | date: '%Y' }} {{ site.name | default: site.title }}. {{ site.data.ui-text[site.locale].powered_by }} <a href="http://jekyllrb.com" rel="nofollow">Jekyll</a> &amp; <a href="https://mademistakes.com/work/minimal-mistakes-jekyll-theme/" rel="nofollow">Minimal Mistakes</a>.</div>
+<div class="page__footer-copyright">
+  &copy; {{ site.time | date: '%Y' }} {{ site.name | default: site.title }}. {{ site.data.ui-text[site.locale].powered_by }}
+  <a href="http://jekyllrb.com" rel="nofollow">Jekyll</a> &amp;
+  <a href="https://mademistakes.com/work/minimal-mistakes-jekyll-theme/" rel="nofollow">Minimal Mistakes</a>.
+  <a href="{{site.github.repository_url}}/blob/master/{{page.path}}">Edit this page</a>
+</div>
+<br>