ci: enable Dependabot for major and patch npm updates only

Ignore semver-minor updates to reduce noise. Weekly schedule on Mondays.

Author: reaatech

.github/dependabot.yml

@@ -0,0 +1,23 @@
+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "09:00"
+      timezone: "America/Los_Angeles"
+    open-pull-requests-limit: 10
+    versioning-strategy: increase
+    ignore:
+      - dependency-name: "*"
+        update-types: ["version-update:semver-minor"]
+    labels:
+      - "dependencies"
+      - "dependabot"
+    commit-message:
+      prefix: "chore"
+      prefix-development: "chore"
+      include: "scope"
+    reviewers:
+      - "reaatech"