Fix funkwhale#101: credit Francis Gading for the logotype

_includes/footer.html

+<div class="page__footer-follow">
+  <ul class="social-icons">
+    {% if site.data.ui-text[site.locale].follow_label %}
+      <li><strong>{{ site.data.ui-text[site.locale].follow_label }}</strong></li>
+    {% endif %}
+    {% if site.twitter.username %}
+      <li><a href="https://twitter.com/{{ site.twitter.username }}"><i class="fab fa-fw fa-twitter-square" aria-hidden="true"></i> Twitter</a></li>
+    {% endif %}
+    {% if site.facebook.username %}
+      <li><a href="https://www.facebook.com/{{ site.facebook.username }}"><i class="fab fa-fw fa-facebook-square" aria-hidden="true"></i> Facebook</a></li>
+    {% endif %}
+    {% if site.author.github %}
+      <li><a href="https://github.com/{{ site.author.github }}"><i class="fab fa-fw fa-github" aria-hidden="true"></i> GitHub</a></li>
+    {% endif %}
+    {% if site.author.gitlab %}
+      <li><a href="https://gitlab.com/{{ site.author.gitlab }}"><i class="fab fa-fw fa-gitlab" aria-hidden="true"></i> Gitlab</a></li>
+    {% endif %}
+    {% if site.author.bitbucket %}
+      <li><a href="https://bitbucket.org/{{ site.author.bitbucket }}"><i class="fab fa-fw fa-bitbucket" aria-hidden="true"></i> Bitbucket</a></li>
+    {% endif %}
+    <li><a href="{% if site.atom_feed.path %}{{ site.atom_feed.path }}{% else %}{{ '/feed.xml' | relative_url }}{% endif %}"><i class="fas fa-fw fa-rss-square" aria-hidden="true"></i> {{ site.data.ui-text[site.locale].feed_label | default: "Feed" }}</a></li>
+  </ul>
+</div>
+
+<div class="page__footer-copyright">&copy; {{ site.time | date: '%Y' }} {{ site.name | default: site.title }}. The funkwhale logo was kindly designed and provided by Francis Gading. {{ site.data.ui-text[site.locale].powered_by | default: "Powered by" }} <a href="https://jekyllrb.com" rel="nofollow">Jekyll</a> &amp; <a href="https://mademistakes.com/work/minimal-mistakes-jekyll-theme/" rel="nofollow">Minimal Mistakes</a>.</div>