Create Cells sections as separate files

Kamil Trzcińskirequested to merge
cells-rename-namespace-to-group into master

What does this MR do and why?

Follow-up:

This updates to latest terminology. Each organization will have many top-level groups. Each group might have groups or projects.

Cleanup images as well.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Kamil Trzciński

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