Configure Dependabot to check for outdated npm package dependencies

Dependabot will periodically check all npm package dependencies of the project. If any are found to be outdated, it will
submit a pull request to update them.

Author: per1234

.github/dependabot.yml

@@ -10,3 +10,10 @@ updates:
       interval: daily
     labels:
       - "topic: infrastructure"
+
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: daily
+    labels:
+      - "topic: infrastructure"