[Ghm-discuss] Tidy webpages

[beuc]

Hey,

I just realised I had webpages commit privs and I did a little bit of
clean-up on the GHM 2014 webpages (resurrecting upcoming.html as
2014/, linking to the audio-video page), and also fixed path to my
animation in 2013/paris/ .

Cheers!
Sylvain