fixes #7161

It shouldn't be allowed!

This reverts commit 46097ba8.

closes #7160

Remove devise-token_authenticatable gem and only generate a token to be
used by the chat.

This token is only used for the chat, it isn't an official API.

[ci skip]

closes #7151

closes #7145

closes #7132

closes #7131

OpenID Connect spec says:

"The issuer returned by discovery MUST exactly match the value of iss in the ID Token."

https://openid.net/specs/openid-connect-core-1_0.html#IssuerIdentifier

closes #7081

fixes #4319

closes #7118

closes #7137

fixes #7136

closes #7155

Not needed anymore with sidekiq 4.2

closes #7153

closes #7149