OIDC auth does not use /.well-known/openid-configuration

[wkloucek]

OIDC auth does not use /.well-known/openid-configuration. We should use it to also support eg. Keycloak.

See

cdperf/src/lib/auth/openIDConnect.ts

Lines 21 to 23 in 3b88374

	this.#redirectURL = `${baseURL}/oidc-callback.html`;
	this.#logonURL = `${baseURL}/signin/v1/identifier/_/logon`;
	this.#tokenURL = `${baseURL}/konnect/v1/token`;

[wkloucek]

Actually this is also quite outdated already. Nowadays we should prefer the webfinger endpoint over the <ocis-url>/.well-known/openid-configuration for IDP discovery.