* docs(i18n): add Greek translations
Give Greek-speaking readers localized onboarding guidance and begin website coverage while keeping incomplete pages on the explicit English fallback.
- Add the reviewed Greek README and place Greek last in every language selector.
- Register Greek website localization and include 206 translated messages.
- Keep incomplete routes nonindexable and replace fixed translation counts with inventory-based coverage.
Refs #2984
* docs(website): improve Greek homepage wording
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