docs: adds article for OAuth2 and OIDC disovery endpoints (#2324)

* chore: added image for device authorization flow

* chore: adding wellknown endpoint discovery doc

* docs: Adds article for OAuth2 and OIDC disovery endpoints

* docs: fixed formatting issues

* Update docs/oauth2-oidc/wellknown-endpoint-discovery.mdx

Co-authored-by: Vincent <vincent@ory.sh>

* Update docs/oauth2-oidc/wellknown-endpoint-discovery.mdx

Co-authored-by: Vincent <vincent@ory.sh>

* Update docs/oauth2-oidc/wellknown-endpoint-discovery.mdx

Co-authored-by: Vincent <vincent@ory.sh>

* git commit -a -m "chore: updated with feedback"

* chore: updated format

* chore: fix format

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Co-authored-by: Vincent <vincent@ory.sh>

Author: unatasha8