docs: add myst.yml, .gitignore, and deploy-docs workflow

Author: Guo-Zhang

.github/workflows/deploy-docs.yml

@@ -0,0 +1,38 @@
+name: Deploy docs to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - docs/**
+      - .github/workflows/deploy-docs.yml
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - run: pip install mystmd
+      - run: myst build --html
+        working-directory: docs
+        env:
+          BASE_URL: /qtcloud-write/
+      - run: cp docs/_build/html/index.html docs/_build/html/404.html
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs/_build/html
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - uses: actions/deploy-pages@v4

docs/.gitignore

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+_build/

docs/myst.yml

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+# See docs at: https://mystmd.org
+version: 1
+project:
+  title: 量潮写作云
+  description: QtCloud Write 产品文档
+  keywords: []
+  authors: []
+  toc:
+    - file: index.md
+    - title: BRD（业务需求文档）
+      children:
+        - file: brd/index.md
+    - title: PRD（产品需求文档）
+      children:
+        - file: prd/index.md
+        - file: prd/discern.md
+        - file: prd/inherit.md
+    - title: ADD（架构设计文档）
+      children:
+        - file: add/index.md
+    - title: IXD（交互设计文档）
+      children:
+        - file: ixd/index.md
+        - file: ixd/review.md
+    - title: PMD（项目管理文档）
+      children:
+        - file: pmd/index.md
+    - title: QA（质量保证文档）
+      children:
+        - file: qa/index.md
+site:
+  template: book-theme