Remove incorrect github_url

Author: DimitriPapadopoulos

_config.yml

@@ -25,7 +25,7 @@ expiration_news: 370
 # Social settings
 500px_url: http://www.neurospin-wiki.org/pmwiki/Main/DirectionsToNeurospin
 #facebook_url: https://www.facebook.com/pages/NeuroSpin/171075046414933
-github_url: https://github.com/brainomicsteam
+#github_url: https://github.com/brainomicsteam
 #twitter_url: https://twitter.com/neurospin_91
 #youtube_url: https://www.youtube.com/CEASaclay
 map_url: https://www.google.fr/maps/@48.720535,2.1467526,16z?hl=en