Add CC-BY copyright assertion

_includes/footer.html

@@ -0,0 +1,29 @@
+{% comment %}
+  CHANGES FROM DEFAULT FOOTER.HTML
+  * Add CC-BY copyright assertion (from https://fossgovernance.org/)
+{% endcomment %}
+<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.footer.links %}
+      {% for link in site.footer.links %}
+        {% if link.label and link.url %}
+          <li><a href="{{ link.url }}" rel="nofollow noopener noreferrer"><i class="{{ link.icon | default: 'fas fa-link' }}" aria-hidden="true"></i> {{ link.label }}</a></li>
+        {% endif %}
+      {% endfor %}
+    {% endif %}
+
+    {% unless site.atom_feed.hide %}
+      <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>
+    {% endunless %}
+  </ul>
+</div>
+
+<div class="page__footer-copyright">
+  <p>&copy; {{ site.time | date: '%Y' }} the the session organizers and speakers. {{ 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>.<br />
+  <p>Unless otherwise stated, all content is licensed under the <a href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution v4.0 International license</a>. <a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" /></a>
+  </p>
+</div>