Add workflow to publish web assembly

.github/workflows/deploy.yml

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+name: Build and Deploy
+
+on:
+  push:
+    branches:
+      - master
+  pull_request_target:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  native:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        ref: ${{ github.event.pull_request.head.ref }}
+        repository: ${{ github.event.pull_request.head.repo.full_name }}
+        submodules: recursive
+    - name: Add base repo to git config
+      run: git remote add upstream ${{ github.event.pull_request.base.repo.html_url }}
+      if: startsWith(github.event_name, 'pull_request')
+
+    - uses: lukka/get-cmake@latest
+
+    - name: Run CMake+vcpkg to build packages.
+      uses: lukka/run-cmake@v10
+      with:
+        configurePreset: 'ninja-multi-vcpkg'
+        buildPreset: 'ninja-multi-vcpkg-release'
+
+  web:
+    runs-on: ubuntu-latest
+
+    env:
+      EMSDK: '/tmp/emsdk'
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        ref: ${{ github.event.pull_request.head.ref }}
+        repository: ${{ github.event.pull_request.head.repo.full_name }}
+        submodules: recursive
+    - name: Add base repo to git config
+      run: git remote add upstream ${{ github.event.pull_request.base.repo.html_url }}
+      if: startsWith(github.event_name, 'pull_request')
+
+    - name: Setup Emscripten
+      run: |
+        git clone https://github.com/emscripten-core/emsdk.git ${EMSDK}
+        cd ${EMSDK}
+        ./emsdk install latest
+        ./emsdk activate latest
+
+    - uses: lukka/get-cmake@latest
+
+    - name: Run CMake+vcpkg to build packages.
+      uses: lukka/run-cmake@v10
+      with:
+        configurePreset: 'emscripten-vcpkg'
+        buildPreset: 'emscripten-vcpkg-debug'
+
+    - name: Prepare for web deploy
+      run: |
+        mv cmake-build-presets/emscripten-vcpkg/Debug/openblack-imgui-prototype.html cmake-build-presets/emscripten-vcpkg/Debug/index.html
+        cp main.cpp cmake-build-presets/emscripten-vcpkg/Debug
+
+    - name: Deploy to GitHub Pages
+      uses: peaceiris/actions-gh-pages@v3
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        publish_dir: ./cmake-build-presets/emscripten-vcpkg/Debug
+        publish_branch: gh-pages
+        destination_dir: ${{ startsWith(github.event_name, 'pull_request') && format('pr/{0}', github.event.pull_request.number) || '' }}
+
+    - name: Comment PR
+      if: github.event_name == 'pull_request_target'
+      uses: actions/github-script@v5
+      with:
+        github-token: ${{secrets.GITHUB_TOKEN}}
+        script: |
+          const url = `https://${{ github.repository_owner }}.github.io/${{ github.event.repository.name }}/pr/${{ github.event.pull_request.number }}`
+          const message = `🚀 PR was deployed in preview environment: [Open app](${url})`
+          const comments = await github.rest.issues.listComments({
+            issue_number: context.issue.number,
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+          });
+          const botComment = comments.data.find(comment => comment.user.login === 'github-actions[bot]');
+          if (botComment) {
+            await github.rest.issues.updateComment({
+              comment_id: botComment.id,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: message,
+            });
+          } else {
+            await github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: message,
+            });
+          }

README.md

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+Black & White style ImGui Theme prototype
+===
+
+[Try it live](https://openblack.github.io/openblack-imgui-prototype)