Update Actions with Lychee and GitHub Token

[pderrenger]

This pull request adds an improved Ultralytics Actions workflow to automatically format code and documentation to the new Ultralytics official standards maintained at https://github.com/ultralytics/actions.

Five individual actions are run by default now including a new broken links check for markdown and HTML files. Disable individual actions by setting them to false or removing their line, i.e. delete 'markdown: true' line to disable markdown formatting.

To customize an action use a pyproject.toml file in this repo. For details see https://github.com/ultralytics/actions.

# Ultralytics 🚀 - AGPL-3.0 license
# Ultralytics Actions https://github.com/ultralytics/actions
# This workflow automatically formats code and documentation in PRs to official Ultralytics standards

name: Ultralytics Actions

on:
  push:
    branches: [main]
  pull_request_target:
    branches: [main]

jobs:
  format:
    runs-on: ubuntu-latest
    steps:
      - name: Run Ultralytics Formatting
        uses: ultralytics/actions@main
        with:
          token: ${{ secrets.GITHUB_TOKEN }}  # automatically generated
          python: true
          docstrings: true
          markdown: true
          spelling: true
          links: true

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced GitHub Actions and improved repository documentation.

📊 Key Changes

• GitHub Actions now trigger on pushes and pull requests to both main and master branches.
• A new links check is included in the formatting GitHub Actions workflow.
• A status badge for GitHub Actions has been added to the README.

🎯 Purpose & Impact

• 🔄 Dual Branch Support: Including both main and master branches for actions ensures compatibility with repositories using either naming convention, making the template more versatile.
• 🔗 Links Validation: The links validation will help maintain the integrity and reliability of external references in the project's documentation.
• 📈 Visibility of Actions Status: The badge in the README allows users to quickly see the status of these formatting actions, increasing transparency and trust in the repository's maintenance practices.