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 <daan.hoogland@gmail.com>
Co-authored-by: Pearl Dsilva <pearl1594@gmail.com>

* 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 <sureshkumar.anaparti@gmail.com>

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Co-authored-by: dahn <daan.hoogland@gmail.com>
Co-authored-by: Pearl Dsilva <pearl1594@gmail.com>
Co-authored-by: Suresh Kumar Anaparti <sureshkumar.anaparti@gmail.com>

Author: 4 people