Added licenses for website source code and content

i2p2www/pages/global/footer.html

@@ -31,3 +31,8 @@
       <div class='aside fifth'>
         <a class='button' href="{{ site_url('get-involved/donate') }}">{{ _('Donate') }}</a>
       </div>
+      <div class='aside sixth'>
+        <ul>
+          <li><a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="{{ url_for('static', filename='images/cc-by-sa-4.0.png') }}" /></a><br />Except where otherwise noted, content on this site is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.</li>
+        </ul>
+      </div>