Docs: Introduce decision about the themes feature #DS-1489

[adamkudrna]

Description

Additional context

Issue reference

https://jira.almacareer.tech/browse/DS-1489

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Lighthouse	1 paths audited Performance: 96 (🟢 up 1 from production) Accessibility: 93 (no change from production) Best Practices: 100 (no change from production) SEO: 90 (no change from production) PWA: - View the detailed breakdown and full score reports

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[crishpeen]

Maybe this can be merged in the main branch? It is independent on the integration branch and it would be nice to have in the history before it.