Adds publish of docs for non-main-branch

This way we can test it out/share

.github/workflows/docs-preview.yml

@@ -0,0 +1,35 @@
+name: Deploy PR previews
+
+on:
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - closed
+
+concurrency: preview-${{ github.ref }}
+
+jobs:
+  deploy-preview:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-python@v3
+      - uses: actions/checkout@v3
+      - name: Install Python and Build Docs
+        if: github.event.action != 'closed' # Skip the build if the PR is closed
+        run: |
+          pip install -e ".[documentation]"
+          sphinx-build docs -b dirhtml _build
+
+      - name: Deploy preview
+        if: github.event.action != 'closed'
+        uses: rossjrw/pr-preview-action@v1
+        with:
+          source-dir: ./_build/html/ # This is where Sphinx outputs the built docs
+
+      - name: Cleanup preview
+        if: github.event.action == 'closed'
+        uses: rossjrw/pr-preview-action@v1
+        with:
+          action: delete # This removes the PR preview when the PR is closed