chore: update template checklists and introduce link to contributing guide

[morri-son]

On-behalf-of: Gerald Morrison (SAP) gerald.morrison@sap.com

What this PR does / why we need it

update template checklists and introduce link to contributing guide

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[frewilhelm]

Now there are duplicate entries in the checklist that are in Contributing and the templates. I thought we wanted content checklists in the Contributing guide and technical checklists in the templates.

[morri-son]

Now there are duplicate entries in the checklist that are in Contributing and the templates. I thought we wanted content checklists in the Contributing guide and technical checklists in the templates.

yes, we have some duplicates now as I took over some of the items from the checklist, that I found valuable for an author in the templates and that fit to both content and style, like that commands needs to be correct and copyable and that the prerequites need to contain everything. But I think the current checklists in the templates now really fit to all sections of the doc in the right order.