Update repository references from NREL-Sienna to Sienna-Platform and adjust README NLR wording#9

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copilot/update-nrel-sienna-to-sienna-platform

Commits on Apr 20, 2026

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Commits on Apr 21, 2026

Update org, docs domain, and Slack workspace references

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Update README to note NLR formerly known as NREL

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