Update JupyterHub helm values

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What does this MR do?

Updates the JupyterHub helm values because the current values in our docs is outdated. Using the existing values results in below errors:

coalesce.go:286: warning: cannot overwrite table with non table for jupyterhub.hub.extraConfig (map[])
Error: values don't meet the specifications of the schema(s) in the following chart(s):
jupyterhub:
- (root): Additional property auth is not allowed
- (root): Additional property gitlab is not allowed
- hub.extraConfig: Invalid type. Expected: object, given: string

Related issues

• Support ticket - internal only
• https://discourse.jupyter.org/t/i-am-unable-to-create-a-gitlab-integration-with-the-recommended-jupyterhub-config/13034/3
• https://github.com/jupyterhub/oauthenticator/issues/372#issuecomment-774315350

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