Replace JS demo with WASM DasherCore build

.github/workflows/build-deploy.yml

@@ -0,0 +1,72 @@
+name: Build and Deploy Demo
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Setup Emscripten
+        uses: mymindstorm/setup-emsdk@v14
+        with:
+          version: latest
+
+      - name: Verify emcc
+        run: emcc --version
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install Ninja
+        run: sudo apt-get update && sudo apt-get install -y ninja-build
+
+      - name: Build WASM module
+        working-directory: wasm-build
+        run: bash build.sh
+
+      - name: Stage demo for Pages
+        run: |
+          mkdir -p _site
+          cp wasm-build/demo.html _site/index.html
+          cp wasm-build/dasher-wasm-wrapper.js _site/
+          cp -r wasm-build/wasm _site/wasm
+          touch _site/.nojekyll
+
+      - name: Upload artifact
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: _site
+
+  deploy:
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.gitmodules

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+[submodule "wasm-build/dashercore-src"]
+	path = wasm-build/dashercore-src
+	url = https://github.com/dasher-project/DasherCore.git
+	branch = feature-CAPI