allow dependabot to check for updates to github actions and npm

Author: iOvergaard

.github/dependabot.yml

@@ -0,0 +1,14 @@
+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'daily'
+
+  # Maintain dependencies for npm
+  - package-ecosystem: 'npm'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
+    open-pull-requests-limit: 3