Hello,

Could you please implement an ability to specify

• either a provider name which would be displayed on the OIDC login button, e.g. "MyProvider" would become "Login with MyProvider" on the button,
• or a OIDC login button text, e.g. "Sign in with MyProvider".

Currently it's taken from a provider url, e.g. "Login with my-provider.net"
https://github.com/knadh/listmonk/blob/master/cmd/auth.go#L213