Markdownify copyright notice (#219)

Co-authored-by: Léo GATELLIER <leo.gatellier@soprasteria.com>

layouts/partials/footer.html

@@ -97,7 +97,7 @@
           Toha
         </a>
       </div>
-      <div class="col-md-4 text-center">{{ $copyrightNotice }}</div>
+      <div class="col-md-4 text-center">{{ $copyrightNotice | markdownify }}</div>
       <div class="col-md-4 text-right">
         <a id="hugo" href="https://gohugo.io/">{{ i18n "hugoAttributionText" }}
         <img