Update trademark FAQ link in footer

will-fix https://dip.torproject.org/web/tpo/issues/39 partly

templates/macros/footer.html

 {% macro render_faq() %}
-  <a href="https://www.torproject.org/docs/trademark-faq" target="_blank" class="text-primary text-light"><u>FAQ</u></a>
+  <a href="https://www.torproject.org/about/trademark/" target="_blank" class="text-primary text-light"><u>FAQ</u></a>
 {% endmacro %}