📝 Docs: re-org and improve getting started docs (#290)

Co-authored-by: galshi <59773096+galshi@users.noreply.github.com>

Author: yanyongyu

docs/quickstart/index.md

@@ -1,6 +1,6 @@
 # Quick Start
 
-Here are some common use cases to help you get started quickly. For more detailed usage, please refer to the [Usage](../usage/authentication.md) section.
+Here are some common use cases to help you get started quickly. For more detailed usage, please refer to the [Usage](../usage/getting-started/authentication.md) section.
 
 !!! note