docs: add Ascend NPU example links

[zcxGGmu]

Summary

• Add an English install-guide pointer for Ascend NPU users.
• Link to the existing DeepSeek-R1/V3 and Qwen3 MoE Ascend NPU deployment examples.
• Call out the validated Atlas 300I A2 path and where to find CANN / torch_npu setup details.

Refs #1504

Test Plan

• python documentation guard check for the new Ascend NPU entry and linked document targets
• git diff --check HEAD~1..HEAD

[greptile-apps]

Greptile Summary

This PR adds an Ascend NPU documentation entry to doc/en/install.md, pointing English-reading users to two existing Chinese-language deployment guides and clarifying that the validated hardware target is the Atlas 300I A2. It also removes a stray blank line between the CUDA bullet and its code block.

• Adds an Ascend NPU bullet with links to the DeepSeek-R1/V3 and Qwen3 MoE Ascend NPU tutorials (both files confirmed present at doc/zh/).
• Both relative paths (../zh/DeepseekR1_V3_tutorial_zh_for_Ascend_NPU.md and ../zh/Qwen3-MoE_tutorial_zh_for_Ascend_NPU.md) resolve correctly from doc/en/install.md.
• Removes a blank line that previously separated the CUDA bullet from its shell snippet.

Confidence Score: 5/5

Documentation-only change; both linked files are confirmed present and relative paths resolve correctly.

The change adds two relative links to existing files and removes one cosmetic blank line. Both target files exist at the expected paths, so no dead links are introduced. The Ascend NPU entry is placed within the preparation list, which clearly labels it as an alternative hardware path, so the context is unambiguous.

Files Needing Attention: No files require special attention.

Important Files Changed

Filename	Overview
doc/en/install.md	Adds an Ascend NPU preparation bullet with two valid relative links to existing Chinese tutorials; removes a cosmetic blank line. No broken links or misleading content.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[User reads doc/en/install.md] --> B{Hardware}
    B -- NVIDIA GPU --> C[Follow CUDA setup]
    B -- Ascend NPU --> D[Atlas 300I A2 path]
    D --> E[doc/zh/DeepseekR1_V3_tutorial_zh_for_Ascend_NPU.md]
    D --> F[doc/zh/Qwen3-MoE_tutorial_zh_for_Ascend_NPU.md]
    C --> G[Continue Linux-x86_64 prerequisites]
    E --> H[CANN / torch_npu setup and launch commands]
    F --> H

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