Add a github action for documentation building.

.github/workflows/build_docs.yaml

@@ -0,0 +1,25 @@
+name: "Pull Request Docs Check"
+
+on:
+- workflow_dispatch
+- pull_request
+
+jobs:
+  docs:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python 3.11
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.11'
+    - name: Install dependencies and local packages
+      run: python -m pip install sphinx pydata-sphinx-theme
+    - name: Build HTML documentation with Sphinx
+      run: make html
+      working-directory: docs
+    - uses: actions/upload-artifact@v4
+      with:
+        name: documentation
+        path: docs/build/html
+        retention-days: 7

dev-requirements.txt

@@ -3,4 +3,3 @@ micropy-cli
 mpremote
 pydata-sphinx-theme
 sphinx
-unittest