fix github routing with hack

.github/workflows/deploy.yaml

@@ -12,13 +12,30 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v2
 
+    - name: Cache Rust dependencies
+      uses: actions/cache@v2
+      with:
+        path: |
+          ~/.cargo/bin/
+          ~/.cargo/registry/index/
+          ~/.cargo/registry/cache/
+          ~/.cargo/git/db/
+          target/
+        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+
     - name: Install minimal nightly with clippy and rustfmt
       uses: actions-rs/toolchain@v1
       with:
         profile: minimal
         toolchain: nightly
         components: rustfmt, clippy
 
+    - name: Run rustfmt
+      run: cargo fmt --all -- --check
+
+    - name: Run clippy
+      run: cargo clippy --all-targets --all-features -- -D warnings
+
     - name: Add wasm target
       run: rustup target add wasm32-unknown-unknown
 
@@ -31,6 +48,9 @@ jobs:
     - name: Build Rust project with trunk
       run: trunk build
 
+    - name: Create 404 redirection for SPA
+      run: cp dist/index.html dist/404.html
+
     - name: Deploy to GitHub Pages
       uses: peaceiris/actions-gh-pages@v3
       with: