docs: add VitePress site scaffold and deploy workflow

Static docs site built from the existing docs/ tree, no restructuring:

- docs/.vitepress/config.mts: README.md rewritten to site index, sidebar
  for existing pages only, dead-link checking kept on so broken relative
  links fail the build
- Site tooling contained in docs/ (package.json, lockfile, gitignore) so
  the repo root stays .NET-only
- .github/workflows/docs-site.yml: build + deploy to Azure Static Web
  Apps (AZURE_STATIC_WEB_APPS_API_TOKEN_DOCS secret) on docs/** pushes
  to main; build-check only on PRs

Verified locally: npm ci + vitepress build passes with zero dead links.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: mohnjiles

.github/workflows/docs-site.yml

@@ -0,0 +1,73 @@
+name: Docs Site
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'docs/**'
+  pull_request:
+    paths:
+      - 'docs/**'
+  workflow_dispatch:
+
+concurrency:
+  group: docs-site-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build_and_deploy:
+    if: github.event_name != 'pull_request'
+    runs-on: ubuntu-latest
+    name: Build and deploy docs site
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: docs/package-lock.json
+
+      - name: Install dependencies
+        working-directory: docs
+        run: npm ci
+
+      - name: Build VitePress site
+        working-directory: docs
+        run: npx vitepress build .
+
+      - name: Deploy to Azure Static Web Apps
+        uses: Azure/static-web-apps-deploy@v1
+        with:
+          azure_static_web_apps_api_token: ${{ secrets.AZURE_STATIC_WEB_APPS_API_TOKEN_DOCS }}
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          action: upload
+          app_location: 'docs/.vitepress/dist'
+          skip_app_build: true
+
+  build_check:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    name: Build check (docs site)
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: docs/package-lock.json
+
+      - name: Install dependencies
+        working-directory: docs
+        run: npm ci
+
+      - name: Build VitePress site
+        working-directory: docs
+        run: npx vitepress build .

docs/.gitignore

@@ -0,0 +1,3 @@
+node_modules
+.vitepress/dist
+.vitepress/cache

docs/.vitepress/config.mts

@@ -0,0 +1,86 @@
+import { defineConfig } from 'vitepress'
+
+export default defineConfig({
+  title: 'Stability Matrix Docs',
+  description: 'Documentation for Stability Matrix, a multi-platform package manager for Stable Diffusion and related AI tools.',
+
+  // Keep README.md as the single source of truth for the home page content,
+  // while serving it at the site root (index.html) instead of /README.html.
+  rewrites: {
+    'README.md': 'index.md'
+  },
+
+  // Dead-link checking stays ON (default) so a future PR that breaks a
+  // relative link fails the build instead of shipping silently.
+  ignoreDeadLinks: false,
+
+  appearance: 'dark',
+
+  themeConfig: {
+    outline: 'deep',
+
+    nav: [
+      { text: 'Home', link: '/' },
+      { text: 'Getting Started', link: '/getting-started/overview' },
+      { text: 'Package Manager', link: '/package-manager/overview' },
+      { text: 'Inference', link: '/inference/overview' },
+      { text: 'Advanced', link: '/advanced/overview' },
+      { text: 'Tips and Tricks', link: '/tips/overview' }
+    ],
+
+    sidebar: {
+      '/getting-started/': [
+        {
+          text: 'Getting Started',
+          items: [
+            { text: 'Overview', link: '/getting-started/overview' },
+            { text: 'Installation', link: '/getting-started/installation' },
+            { text: 'First Launch', link: '/getting-started/first-launch' },
+            { text: 'Data Directory', link: '/getting-started/data-directory' }
+          ]
+        }
+      ],
+      '/package-manager/': [
+        {
+          text: 'Package Manager',
+          items: [
+            { text: 'Overview', link: '/package-manager/overview' },
+            { text: 'Supported Packages', link: '/package-manager/supported-packages' },
+            { text: 'Installing Packages', link: '/package-manager/installing-packages' }
+          ]
+        }
+      ],
+      '/inference/': [
+        {
+          text: 'Inference',
+          items: [
+            { text: 'Overview', link: '/inference/overview' }
+          ]
+        }
+      ],
+      '/advanced/': [
+        {
+          text: 'Advanced',
+          items: [
+            { text: 'Overview', link: '/advanced/overview' },
+            { text: 'ComfyUI Integration', link: '/advanced/comfyui-integration' },
+            { text: 'Environment Variables', link: '/advanced/environment-variables' }
+          ]
+        }
+      ],
+      '/tips/': [
+        {
+          text: 'Tips and Tricks',
+          items: [
+            { text: 'Overview', link: '/tips/overview' },
+            { text: 'Terminology', link: '/tips/terminology' }
+          ]
+        }
+      ]
+    },
+
+    socialLinks: [
+      { icon: 'github', link: 'https://github.com/LykosAI/StabilityMatrix' }
+    ]
+  }
+})