Remove dota2vods tab (broken) and fix GG rankings link

dota2vods.net has been down for some time (7 months?) and the tab doesn't get any data or anything and it kind of pointless to have as it's empty and the link is broken.

GosuGamers ranking link required a user to log into GG to see the rankings (maybe? GG registration broke for me), while just simply removing "/clan" from the links takes a user to the rankings list without having to login.