Added license and overview page

[fhennig]

No description provided.

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[fhennig]

@stefanigel could you review this?

This is the product information page: https://deploy-preview-439--stackable-docs.netlify.app/home/nightly/product-information

and this is the license page: https://deploy-preview-439--stackable-docs.netlify.app/home/nightly/licenses

Additionally every demo now has system requirements and an installation section: https://deploy-preview-439--stackable-docs.netlify.app/stackablectl/stable/demos/

And stackablectl also has system requirements: https://deploy-preview-439--stackable-docs.netlify.app/stackablectl/stable/installation#system-requirements

The only thing missing from the ticket is the SBOMs, but they are not ready yet.

Link to ticket: https://github.com/stackabletech/internal-issues/issues/43

[stefanigel]

The most important issues:

• Also the data products themselves are part of SDP and a support subscription
• Supported K8s versions seems to be outdated?