There are plenty of Arduino Git's already.
However be careful with the word "resources" as the Arduino version is not what you might think.
It would be a simple matter to clone most of the official ones but I don't really see any point.
As for Project hub I think they have parted ways with Hackster and so far the Arduino version seems to quite crippled by red tape. The Hackster version is my preferred goto.
For me I spent quite a lot of time googling project hubs etc.
I found some. But now i keep finding more.
It would be useful for me maybe for other people to..
Yeah, the Arduino "awesome" lists are not so prominent. I only mentioned the Arduino "awesome" lists because they happen to have the subject matter of interest.
I recommend using the more prominent "awesome" lists with tens or hundreds of thousands of stars from my first link as possible inspiration for the structure of your project.