[stg] site: Build unified Fedora Atomic Desktops docs

Timothée Ravierrequested to merge
Siosm/fedora-docs-fp-o:stg-atomic-desktops-unified-docs into stg

Replace the independent docs for Silverblue, Kinoite and Sway Atomic. It will also provide docs for Budgie Atomic and COSMIC Atomic.

See: pages!25

Edited by Timothée Ravier

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