The website backup is still available on Internet Archive (http://web.archive.org/web/20230705071353/https://itazuraneko.neocities.org/).
Some links may be broken though.
Some of the github repos were archived in the Software Heritage Archive. Some deleted repos i was looking for were available there.
What is the name of anime this frame was taken from?
Well, you can access their profiles with Nitter now.
Kaguya-sama: Love is War