Upgrades Statiq and re-enables docs publishing

Previous versions of Statiq had a bug with .NET 6 RC1. The latest has a workaround that allows publishing

.github/workflows/docs.yaml

@@ -0,0 +1,52 @@
+name: Deploy Documentation
+on:
+    workflow_dispatch:
+    push:
+        paths:
+        - 'docs/**'
+        - 'src/**'
+        - 'test/**'
+        - 'examples/**'
+        - '.github/**'
+
+jobs:
+
+  ###################################################
+  # DOCS
+  ###################################################
+
+  build:
+    name: Deploy
+    runs-on: windows-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Setup dotnet
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 6.0.x
+        include-prerelease: true
+
+    - name: Setup Node.js
+      uses: actions/setup-node@v2
+      with:
+        node-version: '14'
+
+    - name: Cache dependencies
+      uses: actions/cache@v2
+      with:
+        path: ~/.npm
+        key: npm-${{ hashFiles('package-lock.json') }}
+        restore-keys: npm-
+
+    - name: Publish
+      shell: bash
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: |
+        cd docs
+        dotnet run --configuration Release
+        dotnet run -- deploy