[Docs] Enhance Landing Page

[miacycle]

Current State

Need to refresh docs.layer5.io landing page

Desired State

1. Meshery Playground replace with Kanvas.new
2. Meshery Catalog replace with Cloud Catalog
3. Academy
4. Learning Path
5. Challenges

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Contributor Guide and Resources

• 📚 Instructions for contributing to documentation
  • Layer5 documentation site and source
• 🎨 Wireframes and designs for Layer5 site in Figma (open invite)
• 🙋🏾🙋🏼 Questions: Layer5 Discussion Forum and Layer5 Community Slack