Update organization card

README.md

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 Run open models and mainstream AI frameworks on SpacemiT RISC-V platforms with validated deployment, quantization, optimization, demos, and benchmarks.
 
-- [Try AI Lab](https://www.spacemit.com/ailab)
-- [Use K1 / K3 Online](https://gdriscv.com/#/mainboard)
-- Models running on SpacemiT: Coming soon
-- Benchmarks: Coming soon
-- [Documentation](https://www.spacemit.com/community/document)
-- [Forum](https://forum.spacemit.com/)
+**Start:** [AI Lab](https://www.spacemit.com/ailab) · [Use K1 / K3 Online](https://gdriscv.com/#/mainboard)  
+**Explore:** Models running on SpacemiT: Coming soon · Benchmarks: Coming soon · [Documentation](https://www.spacemit.com/community/document) · [Forum](https://forum.spacemit.com/)