add dependabot config

Author: alexkilgour

.github/dependabot.yml

@@ -0,0 +1,13 @@
+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    allow:
+      - dependency-type: "production"
+    schedule:
+      interval: "weekly"
+      # Check for npm updates on Sundays at 9am UTC
+      day: "sunday"
+      time: "09:00"
+    # Disable version updates for npm dependencies
+    open-pull-requests-limit: 0