feat: add Netlify credit (#52)

src/_includes/partials/footer.njk

@@ -5,6 +5,7 @@
     <p>
         <a class="footer-logo-links" aria-label="FLOE Project" href="http://www.floeproject.org/" target="_blank">{% include 'svg/logo-floe.svg' %}</a> <a class="footer-logo-links" aria-label="Prosperity for All" href="http://www.prosperity4all.eu/" target="_blank">{% include 'svg/logo-P4A.svg' %}</a><br/>
     </p>
+    <p>Hosted with <a href="https://netlify.com/">Netlify</a>.</p>
     <p>
         This documentation is licensed under a
         <a rel="license" href="http://creativecommons.org/licenses/by/3.0/">Creative Commons CC BY 3.0</a>.