Migrate docs from Sphinx to MkDocs (#18145)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

docs/api/README.md

@@ -0,0 +1,107 @@
+# Summary
+
+[](){ #configuration }
+
+## Configuration
+
+API documentation for vLLM's configuration classes.
+
+- [vllm.config.ModelConfig][]
+- [vllm.config.CacheConfig][]
+- [vllm.config.TokenizerPoolConfig][]
+- [vllm.config.LoadConfig][]
+- [vllm.config.ParallelConfig][]
+- [vllm.config.SchedulerConfig][]
+- [vllm.config.DeviceConfig][]
+- [vllm.config.SpeculativeConfig][]
+- [vllm.config.LoRAConfig][]
+- [vllm.config.PromptAdapterConfig][]
+- [vllm.config.MultiModalConfig][]
+- [vllm.config.PoolerConfig][]
+- [vllm.config.DecodingConfig][]
+- [vllm.config.ObservabilityConfig][]
+- [vllm.config.KVTransferConfig][]
+- [vllm.config.CompilationConfig][]
+- [vllm.config.VllmConfig][]
+
+[](){ #offline-inference-api }
+
+## Offline Inference
+
+LLM Class.
+
+- [vllm.LLM][]
+
+LLM Inputs.
+
+- [vllm.inputs.PromptType][]
+- [vllm.inputs.TextPrompt][]
+- [vllm.inputs.TokensPrompt][]
+
+## vLLM Engines
+
+Engine classes for offline and online inference.
+
+- [vllm.LLMEngine][]
+- [vllm.AsyncLLMEngine][]
+
+## Inference Parameters
+
+Inference parameters for vLLM APIs.
+
+[](){ #sampling-params }
+[](){ #pooling-params }
+
+- [vllm.SamplingParams][]
+- [vllm.PoolingParams][]
+
+[](){ #multi-modality }
+
+## Multi-Modality
+
+vLLM provides experimental support for multi-modal models through the [vllm.multimodal][] package.
+
+Multi-modal inputs can be passed alongside text and token prompts to [supported models][supported-mm-models]
+via the `multi_modal_data` field in [vllm.inputs.PromptType][].
+
+Looking to add your own multi-modal model? Please follow the instructions listed [here][supports-multimodal].
+
+- [vllm.multimodal.MULTIMODAL_REGISTRY][]
+
+### Inputs
+
+User-facing inputs.
+
+- [vllm.multimodal.inputs.MultiModalDataDict][]
+
+Internal data structures.
+
+- [vllm.multimodal.inputs.PlaceholderRange][]
+- [vllm.multimodal.inputs.NestedTensors][]
+- [vllm.multimodal.inputs.MultiModalFieldElem][]
+- [vllm.multimodal.inputs.MultiModalFieldConfig][]
+- [vllm.multimodal.inputs.MultiModalKwargsItem][]
+- [vllm.multimodal.inputs.MultiModalKwargs][]
+- [vllm.multimodal.inputs.MultiModalInputs][]
+
+### Data Parsing
+
+- [vllm.multimodal.parse][]
+
+### Data Processing
+
+- [vllm.multimodal.processing][]
+
+### Memory Profiling
+
+- [vllm.multimodal.profiling][]
+
+### Registry
+
+- [vllm.multimodal.registry][]
+
+## Model Development
+
+- [vllm.model_executor.models.interfaces_base][]
+- [vllm.model_executor.models.interfaces][]
+- [vllm.model_executor.models.adapters][]