CKS Enhancements docs (#458)

* Add note about node templtes

* Add API params for Advanced Settings

* Extend documentation

* Apply suggestions from code review

Co-authored-by: dahn <[email protected]>
Co-authored-by: Pearl Dsilva <[email protected]>

* Address review comments

* Fix images and typo

* Fix CNI config sample

* Apply suggestions from code review for user data

Co-authored-by: Suresh Kumar Anaparti <[email protected]>

---------

Co-authored-by: dahn <[email protected]>
Co-authored-by: Pearl Dsilva <[email protected]>
Co-authored-by: Suresh Kumar Anaparti <[email protected]>

Author: 4 people