v0.4.0

What's Changed

• Add sphinx 📘 document: https://angle.readthedocs.io/en/latest/index.html
• Reimplement 2DMSE; rename 2DMSE to ☕️ Espresso in #72
• Support fine-tuning and inferring BiLLM-based sentence embeddings in #72
• Upgrade angle-trainer in #72
• Support converting AnglE model to sentence-transformers in #72
• Overhaul README in #69

Full Changelog: v0.3.10...v0.4.0