feat: build yew.rs website with Yew (#2779)

Replace the Docusaurus-based website with a pure Rust/Yew implementation
using static site generation (SSG).

The SSG pipeline compiles each page to WASM, runs wasm-bindgen and
wasm-opt, then captures SSR output for SEO-friendly HTML. All docs
(5 versions x 4 languages), blog posts, community pages, search, and
404 are generated as static files.

Key features:
- Content model with dual HTML/Markdown rendering and copy-as-markdown
- Syntax highlighting via syntect with light/dark themes
- Collapsible sidebar, table of contents, breadcrumbs, and pagination
- 3-state theme toggle (light/dark/system)
- Blog with date-prefixed URLs, index, sidebar, RSS and Atom feeds
- Full-page Algolia search with version faceting
- OpenSearch descriptor, sitemap, robots.txt, 404 page
- SEO: hreflang, OG tags, JSON-LD breadcrumbs, canonical URLs
- CI workflow builds with Rust toolchain instead of Node.js

Author: Madoshakalaka

.github/workflows/build-website.yml

@@ -3,14 +3,18 @@ on:
   pull_request:
     branches: [master]
     paths:
-      - "website/**"
-      - "firebase.json"
+      - "yew-rs/**"
+      - "website/static/**"
+      - "Cargo.toml"
+      - "Cargo.lock"
       - ".github/workflows/*-website.yml"
   push:
     branches: [master]
     paths:
-      - "website/**"
-      - "firebase.json"
+      - "yew-rs/**"
+      - "website/static/**"
+      - "Cargo.toml"
+      - "Cargo.lock"
       - ".github/workflows/*-website.yml"
 
 jobs:
@@ -20,40 +24,29 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - name: Setup node
-        uses: actions/setup-node@v6
+      - name: Setup toolchain
+        uses: dtolnay/rust-toolchain@master
         with:
-          node-version: "lts/Jod"
-          package-manager-cache: false
+          toolchain: stable
+          targets: wasm32-unknown-unknown
 
-      - name: Install dependencies
-        run: |
-          cd website
-          npm ci
-
-      - name: Run prettier
-        id: fmt
-        continue-on-error: true
-        run: |
-          cd website
-          npm run fmt
+      - uses: Swatinem/rust-cache@v2
+        with:
+          save-if: ${{ github.ref == 'refs/heads/master' }}
 
-      - if: steps.fmt.outcome == 'failure'
-        run: |
-          cd website
-          npm run fmt:write
-          git diff
-          exit 1
+      - name: Install wasm-bindgen-cli
+        shell: bash
+        run: ./ci/install-wasm-bindgen-cli.sh
 
-      - name: Check Translations
+      - name: Install binaryen (latest)
         run: |
-          cd website
-          npm run check-translations
+          BINARYEN_URL=$(curl -s https://api.github.com/repos/WebAssembly/binaryen/releases/latest \
+            | grep -o 'https://[^"]*x86_64-linux.tar.gz')
+          curl -sL "$BINARYEN_URL" | tar xz
+          sudo install binaryen-*/bin/wasm-opt /usr/local/bin/
 
-      - name: Build
-        run: |
-          cd website
-          npm run build
+      - name: Build site
+        run: cargo run --release -p yew-site-ssg
 
       - name: Upload build artifact
         uses: actions/upload-artifact@v7