- Add docs/bitnet-embeddings-i2s-guide.md with model overview, I2_S GGUF
conversion details, accuracy verification, inference performance benchmarks,
and quick start examples for both 0.6B (Qwen3) and 270M (Gemma3) models
- Add embedding quantization chart (fig1_quant_per_task.png)
- Remove old docs/bitnet-embeddings-gguf-conversion.md (replaced by new guide)
- Add bitnet-embedding-0.6b and bitnet-embedding-270m to supported HF models
in setup_env.py
- Update README.md What's New section with link to the new guide
