feat: JupyterHub configuration (#715)

* initial page

* keycloak notes

* removed not-yet-existent link

* linting

* wip: native auth

* added initial jupyterhub sections

* correct image refs

* jhub: extra configs and profiles

* initial image/notebook comments

* linting

* notebook summary

* added in-doc links

* cleanup

* Apply suggestions from code review

Co-authored-by: Malte Sander <malte.sander.it@gmail.com>

* consistent caps

* consistent caps II

* typos etc.

* Apply suggestions from code review

Co-authored-by: Malte Sander <malte.sander.it@gmail.com>

* consistent caps III

---------

Co-authored-by: Malte Sander <malte.sander.it@gmail.com>

Author: adwk67

modules/tutorials/images/jupyterhub/admin-user.png

@@ -1,3 +1,4 @@
 * xref:index.adoc[]
 ** xref:authentication_with_openldap.adoc[]
+** xref:jupyterhub.adoc[]
 ** xref:logging-vector-aggregator.adoc[]