built out the docs

apps/docs/docs/api/classes/ListIndexLLMRetriever.md

apps/docs/docs/api/classes/ListIndexRetriever.md

apps/docs/docs/api/classes/OpenAI.md

apps/docs/docs/api/classes/OpenAIEmbedding.md

apps/docs/docs/api/classes/Refine.md

apps/docs/docs/api/classes/Response.md

apps/docs/docs/api/classes/ResponseSynthesizer.md

apps/docs/docs/api/classes/RetrieverQueryEngine.md

apps/docs/docs/api/classes/SentenceSplitter.md

apps/docs/docs/api/classes/SimpleChatEngine.md

apps/docs/docs/api/classes/SimpleNodeParser.md

apps/docs/docs/api/classes/SimpleResponseBuilder.md

apps/docs/docs/api/classes/SubQuestionOutputParser.md

apps/docs/docs/api/classes/SubQuestionQueryEngine.md

apps/docs/docs/api/classes/TextFileReader.md

apps/docs/docs/api/classes/TextNode.md

apps/docs/docs/api/classes/TreeSummarize.md

apps/docs/docs/api/classes/VectorIndexRetriever.md

apps/docs/docs/api/classes/VectorStoreIndex.md

apps/docs/docs/api/enums/ListRetrieverMode.md