Restructured references section of the docs

docs/source/reference/technical-reference/configuration/config-reference.md

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+# Configuration Reference
+
+:::{important}
+Make sure the version of JupyterHub for this documentation matches your
+installation version, as the output of this command may change between versions.
+:::
+
+## JupyterHub configuration
+
+As explained in the [Configuration Basics](generate-config-file)
+section, the `jupyterhub_config.py` can be automatically generated via
+
+> ```bash
+> jupyterhub --generate-config
+> ```
+
+The following contains the output of that command for reference.
+
+```{eval-rst}
+.. jupyterhub-generate-config::
+```
+
+## JupyterHub help command output
+
+This section contains the output of the command `jupyterhub --help-all`.
+
+```{eval-rst}
+.. jupyterhub-help-all::
+```