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docs(install): document NCCL dev libraries for multi-GPU tensor parallelism #90

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- Linux x86_64, NVIDIA GPU, driver r580+ (CUDA 13)
- Python >= 3.10, with [uv](https://docs.astral.sh/uv/) recommended (plain
`pip` + `venv` works too)
- Multi-GPU (`--tensor-parallel-size > 1`): NCCL development libraries for
the JIT link step, e.g. `sudo apt-get install libnccl2 libnccl-dev`.
Without them the first TP launch fails at link time with
`/usr/bin/ld: cannot find -lnccl`.

## Method 1: Install from PyPI

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