Release 0.52.0

See https://docs.lamin.ai/changelog

What's Changed

• 📝 More consistent and simpler docs by @falexwolf in #127
• 🎨 Remove update in add_ontology_from_df by @sunnyosun in #129
• 🔥 Remove .list_source() by @sunnyosun in #130
• 🚚 Add unique constraints and fix gene_ref_is_symbol to label_ref_is_name by @falexwolf in #133

Full Changelog: 0.51.2...0.52.0