Publish docs via GH actions (#22)

* Publish docs via GH actions

* Update publish-docs.yaml

Author: rmorshea

.github/workflows/publish-docs.yaml

@@ -0,0 +1,21 @@
+name: publish-docs
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    name: Deploy docs
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout main
+        uses: actions/checkout@v2
+      - name: Deploy docs
+        # Use mhausenblas/mkdocs-deploy-gh-pages@nomaterial to exclude mkdocs-material theme
+        uses: mhausenblas/mkdocs-deploy-gh-pages@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CONFIG_FILE: docs/mkdocs.yml
+          REQUIREMENTS: requirements/build-docs.txt