Parse package.json funding section

[abitrolly]

Projects like https://github.com/kach/nearley/ use package.json to signal the possible funding methods.

https://github.com/kach/nearley/blob/745c906fcc906a99c902a0ee652a8e5970e319eb/package.json#L59-L62

Would be good if GitHub could detect and use them.

[jlord]

Thanks, this is a great idea, we'd like to surface as much as we can who is sponsorable somewhere 👍