docs: streamline branded README

[DonnieDice]

Summary

• preserve BLU and RealmGX brand colors, badges, and project links
• remove duplicated feature, community, and installation sections
• replace stale hard-coded release details with current links and dynamic badges

Verification

• git diff --check
• verified local logo paths and documentation links

[coderabbitai]

Important

• 🔍 Trigger review

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