ci: add npm to dependabot config (#207)

* add npm to dependabot config

* align dependabot config with other m-lab js repos

Author: sammy200-ui

.github/dependabot.yml

@@ -1,6 +1,29 @@
 version: 2
 updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    open-pull-requests-limit: 10
+    groups:
+      npm-minor-patch:
+        patterns:
+          - "*"
+        update-types:
+          - "minor"
+          - "patch"
+    commit-message:
+      prefix: "chore(deps)"
+
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: "weekly"
+      day: "monday"
+    groups:
+      actions:
+        patterns:
+          - "*"
+    commit-message:
+      prefix: "ci"