Broken source code URL in API docs

[vwkd]

The source code URLs in the API docs are broken. The host is undefined instead of github.com. For example,

https://graphql-js.org/api#ASTKindToNode

links to

https://undefined/graphql/graphql-js/blob/master/language/ast.ts#L191

[mkraft]

It's still undefined for me.