v0.1.3 — Documentation Refresh

This patch release refreshes the package documentation so installation,
model selection, and deployment workflows are easier to discover and follow.
There are no runtime API changes in this release.

Improvements

• Expanded the README to cover the complete workflow, including video,
  training, evaluation, ONNX export, pruning, and quantization.
• Added a documentation index linking directly to the model, data, training,
  evaluation, CLI, and deployment guides.
• Split installation instructions into core, ONNX export, and verified
  export/quantization paths.
• Corrected the ONNX dependency guidance: export requires the export extra,
  while verification and ONNX quantization also require onnxruntime or
  onnxruntime-gpu.
• Linked the end-to-end optimization example and clarified export compatibility
  and reliability guarantees.