[ixpmanager] Broken Link to 20180417-euroix-ixpmanager.pdf

[Tim Densmore]

Hi Folks,

Not sure if this is the best place for this, but I'm not sure where else 
to report it.  Going through the route servers docs on this page:

https://docs.ixpmanager.org/features/route-servers/

This link gives me a 404:
https://www.ixpmanager.org/media/2018/20180417-euroix-ixpmanager.pdf

I was able to find the document at Barry's site, though:
https://www.barryodonovan.com/wp-content/uploads/2019/04/20180417-euroix-ixpmanager.pdf

Thanks,
Tim Densmore