docs: available embeddings (#538)

apps/docs/docs/modules/embeddings/_category_.yml

...cs/modules/embeddings/available_embeddings/_category_.yml

...cs/modules/embeddings/available_embeddings/huggingface.md

...s/docs/modules/embeddings/available_embeddings/mistral.md

...cs/docs/modules/embeddings/available_embeddings/ollama.md

...cs/docs/modules/embeddings/available_embeddings/openai.md

.../docs/modules/embeddings/available_embeddings/together.md

apps/docs/docs/modules/embeddings/index.md

apps/docs/docs/modules/llms/index.md