Update format.yml

[UltralyticsAssistant]

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.

Four individual actions are run by default. To disable actions, set them to false, i.e. 'python: false'.

To customize an action use a pyproject.toml file in this repo, and see the individual action repo for details.

name: Ultralytics Actions

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

jobs:
  format:
    runs-on: ubuntu-latest
    steps:
      - name: Run Ultralytics Formatting
        uses: ultralytics/actions@main
        with:
          python: true
          docstrings: true
          markdown: true
          spelling: true

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updated GitHub Actions for code formatting and enhanced Magellan README guidelines.

📊 Key Changes

• ✨ Replaced the old format workflow with the new Ultralytics Actions for automated code and documentation formatting.
• 👩‍💻 Expanded the formatting actions to include Python, docstrings, markdown files, and spelling checks.
• 📝 Added spacing in the README for better readability and structure around installation requirements.

🎯 Purpose & Impact

• ⚙️ The updated workflow helps ensure all PRs meet Ultralytics' coding and documentation standards automatically, saving time and improving code quality.
• 📚 More comprehensive checks in the formatting process can lead to cleaner, more maintainable, and professionally presented code and docstrings.
• 🔎 Enhanced README guidance aids in user comprehension, promoting a smoother setup experience for new users of the Magellan project.