Add Dependabot configuration for automated npm dependency management

[Copilot]

The repository has active Dependabot workflows but lacks explicit configuration, resulting in default behavior without customization or grouping.

Changes

.github/dependabot.yml - Dependabot configuration

• Weekly npm update schedule (Mondays 09:00 EST)
• Grouped minor/patch updates by dependency type (dev vs prod)
• Scoped commit messages: chore: for production, chore(dev): for dev dependencies
• Labeled PRs with dependencies and dependabot
• Limited to 10 concurrent PRs

version: 2
updates:
  - package-ecosystem: "npm"
    directory: "/"
    schedule:
      interval: "weekly"
      day: "monday"
      time: "09:00"
      timezone: "America/New_York"
    groups:
      development-dependencies:
        dependency-type: "development"
        update-types: ["minor", "patch"]
      production-dependencies:
        dependency-type: "production"
        update-types: ["minor", "patch"]

This reduces PR noise by consolidating related updates while maintaining security through timely dependency updates.

Original prompt

Reference: https://github.com/hlsitechio/hlsitech.com/actions/workflows/dependabot/dependabot-updates

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