docs: simplify README (#18)

* feat: Add Docker, uv, rust-toolchain for reproducible builds

- Add Dockerfile with multi-stage build (CUDA + Rust + Python)
- Add docker-compose.yml for dev/test/gpu services
- Add rust-toolchain.toml pinning nightly-2024-12-01
- Add pyproject.toml with uv for Python dependency management
- Commit Cargo.lock and uv.lock for reproducible builds
- Update CI to verify Docker build works
- Update README with Docker quickstart

Relates to #10 (GPU acceleration)

* docs: improve requirements section, constrain Ray version for macOS

* feat: add ICICLE GPU acceleration dependencies

* fix: use ICICLE git dependencies instead of crates.io

* feat: add GPU benchmark test using ICICLE

* fix: correct ICICLE API call for get_device_properties

* fix: load ICICLE CUDA backend before use

* docs: simplify README requirements and quick start

Author: Masoud