Add Gradio. Update PyO3, rust-numpy, and ndarray.

Add weights, new Bradley-Terry implementation, remove Ignore.

Implement pairwise_scores in Rust, add more benchmarks and tests.

Update docs, fix typing, and add performance benchmarks.

Better documentation and switch to stable Python ABI.

Add documentation, change the indexing API, and sort the scores.

Add average win rate, limit to results, use total, and improve test coverage.

Simplify tests and transfer to Rust only elements, not matrices.

Reimplement PageRank with matrices.

Add naïve counting, fix compatibility with older Python versions.