Signing is not possible anymore, infinite redirect or OAuth error

[abelbraaksma]

The sign button is still present on the live website, however, clicking it, and then selecting either GitHub or Google leads to either an infinite redirection error (GitHub) or an OAuth error (Google).

I propose to either fix this issue, or to disable the sign button, unless a better solution comes around.

Erroneous behavior seen here: https://www.reactivemanifesto.org/