Add Github action to publish/update docs

.github/workflows/docs.yml

@@ -0,0 +1,15 @@
+name: Docs
+
+on:
+  push:
+    branches: ['master']
+  pull_request:
+    branches: ['master']
+  workflow_dispatch:
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run a one-line script
+        run: npm run geojson