Add installation instructions for Ascend NPU

[HwVanICI]

Description

This PR adds documentation for installing AReaL on Ascend NPU platforms.

Related Issue

#747

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not
  work as expected)
• Documentation update
• Code refactoring (no functional changes)
• Performance improvement
• Test coverage improvement

Checklist

• I have read the Contributing Guide
• I have run formatting tools (pre-commit or manual)
• I have run relevant unit tests and they pass
• I have added tests for new functionality
• I have updated documentation if needed
• My branch is up to date with main
• This PR introduces breaking changes (if yes, fill out details below)
• If this PR changes documentation, I have built and previewed it locally with
  jb build docs
• No critical issues raised by AI reviewers (/gemini review)

Breaking Change Details (if applicable):

Additional Context

---

Need help? Check the Contributing Guide or ask in
GitHub Discussions!

[gemini-code-assist]

Summary of Changes

Hello @HwVanICI, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the project's documentation by introducing a dedicated guide for installing AReaL on Ascend NPU platforms. The new documentation aims to streamline the setup process for users leveraging NPU hardware, covering everything from system prerequisites and Docker-based environment configuration to optional distributed training with Ray. This addition broadens the accessibility and usability of AReaL for a wider range of hardware configurations.

Highlights

• New Installation Guide: Added a comprehensive installation guide specifically for Ascend NPU platforms, detailing prerequisites, runtime environment setup, and distributed training configurations.
• Documentation Structure Update: The table of contents (_toc.yml) has been updated to include the new Ascend NPU installation tutorial, making it accessible within the documentation.
• Detailed NPU Setup: The new guide provides specific hardware and software requirements, Docker commands for container creation, and steps for setting up a Ray cluster for multi-node training on Ascend NPUs.

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[gemini-code-assist]

Code Review

This PR adds documentation for installing AReaL on Ascend NPU platforms. The new documentation page is well-structured and provides detailed hardware and software prerequisites, along with instructions for setting up the runtime environment using Docker. My review focuses on improving the clarity and correctness of these instructions. I've identified a critical issue with the configured shared memory size in the Docker command, which would likely cause it to fail. I've also provided suggestions to improve the readability of the Docker command and to clarify some of the instructions in the 'Next Steps' section.