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Motivation
We're planning on retiring our public OpenID provider (openid.stackexchange.com) and SEDE is the last big-ish page that uses it.
Description
This PR allows us to substitute the existing OpenID auth with a StackApp (https://stackapps.com). This will still allow users to log in via username and password, via the StackApps infrastructure.
An additional requirement for the user logging in via this method will be that they have an stackexchange.com account, so that they can allow the app to access their identity. We checked the existing credentials and most of them 5.7k out of 6k already do have an account. We're going to run a manual mapping of those on the server, so the transition will be seamless.
Users will now have to enter their username and password on stackoverflow.com, and grant the SEDE StackApp rights to access their user.