* Modified quick start guide to reflect the new onboarding changes.
* Modified titles to optimize indexing. Left thet titles in title case for now.
* Added side bar labels and also made minor changes to titles.
* Update docs/docs/apis/openidoauth/endpoints.mdx
Co-authored-by: Fabi <fabienne@zitadel.com>
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Co-authored-by: Fabi <fabienne@zitadel.com>
