update footer with credit for
{% block credits %}
<p>
Thanks to Mike Pirnat for the
- <a href="https://www.flickr.com/photos/mikepirnat/27996834601/"
+ <a href="https://www.flickr.com/photos/mikepirnat/34931475515/in/album-72157684291069175/"
>talk photo</a>
and Kushal Das for the
<a href="https://www.flickr.com/photos/kushaldas/16671966733/"
