[refactor] drop doc submodules, link community docs to official sites

[zheliuyu]

Summary

Stop embedding community Ascend/NPU docs via git submodules and local copy. Projects with official doc sites now link out from homepage cards and lightweight sidebar placeholder pages.

Affected: verl, LLaMA-Factory, ms-swift, VeOmni, vLLM-Ascend, Triton-Ascend, DeepSpeed, and ONNX Runtime quick start.

Changes

• Remove 7 git submodules and copy-docs / sync-onnxruntime-doc build steps
• Simplify build to fetch-config → sphinx-build; drop submodules: true in CI
• Replace portal pages with short sources/<project>/index.rst placeholders
• Remove independent sidebar logic (layout.html, independent_communities, related CSS/JS)

Locally maintained docs (accelerate, trl, pytorch, etc.) are unchanged.

Motivation

• Lower CI failure rate and memory usage (no duplicate _repos + _generated content)
• Reduce maintenance of submodule versions and per-project copy rules
• Users get up-to-date docs directly from upstream

Test plan

• make html succeeds locally

[ascend-robot]

CLA Signature Pass

zheliuyu, thanks for your pull request. All authors of the commits have signed the CLA. 👍

[ascend-robot]

CLA Signature Pass

zheliuyu, thanks for your pull request. All authors of the commits have signed the CLA. 👍

[zheliuyu]

Test Plan

• DeepSpeed
• LLaMA-Factory
• VeOmni
• verl
• Triton-Ascend
• ms-swift
• onnxruntime

Result

[hipudding]

ｂ(￣▽￣)ｄ