Remove npm dependency updates from Dependabot config

This commit deletes the configuration for npm dependency updates in .github/dependabot.yml, leaving only GitHub Actions workflow updates. This streamlines automated dependency management to focus on GitHub Actions.

.github/dependabot.yml

@@ -1,30 +1,5 @@
 version: 2
 updates:
-  # Maintain npm dependencies
-  - package-ecosystem: "npm"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-      day: "monday"
-      time: "09:00"
-    open-pull-requests-limit: 10
-    groups:
-      npm_and_yarn:
-        patterns:
-          - "*"
-    commit-message:
-      prefix: "chore"
-      prefix-development: "chore"
-      include: "scope"
-    labels:
-      - "dependencies"
-      - "npm"
-    reviewers:
-      - "xixu-me"
-    assignees:
-      - "xixu-me"
-
-  # Maintain GitHub Actions workflows
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule: