gfycat.com links are broken

[FairplexVR]

Apparently gfycat.com domain no longer exist and I suggest to update the broken links in the following docs

• https://creators.vrchat.com/avatars/avatar-performance-ranking-system/#viewing-detailed-avatar-stats
• https://creators.vrchat.com/avatars/avatar-dynamics/debugging-avatar-dynamics/#in-game-debugging

Thank you

[FairplexVR]

I did find the missing content, if needed:

• avatar-performance-ranking-system
  • https://web.archive.org/web/20230613181953if_/https://gfycat.com/ifr/ImpossibleFarawayLamprey?hd=1
• debugging-avatar-dynamics
  • https://web.archive.org/web/20230823162536if_/https://gfycat.com/ifr/LiveWhimsicalGuineafowl