chore: add a workflow to publish new tagged version of docs

.github/workflows/docs_release.yaml

@@ -0,0 +1,28 @@
+name: Deploy
+
+on:
+  push:
+    tags:
+      - 'v*' # Push events to matching v*, i.e. v1.0, v20.15.10
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.x'
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -e .[docs]
+
+    - name: Build and deploy
+      run: |
+        mike deploy --update-aliases --push --remote origin ${{ github.ref }} latest