Docs: new theme in the TTN 2026 design, shared cookie consent, CI on ubuntu-22.04 (merge at the www cutover) - #561

Docs: new theme in the TTN 2026 design, shared cookie consent, CI on ubuntu-22.04 (merge at the www cutover)#561

wienke merged 5 commits into

masterTheThingsNetwork/docs:masterfrom

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