[Docs] README.md needs updating with correct information

[ritzorama]

Current State

1. The directive usestatic is still referenced, but this is deprecated and should be removed.
2. The current structure is documented as Learning Path → Course → Chapter → Lesson, which does not reflect the latest content hierarchy.
3. There is no link to our official documentation site, which makes it harder for contributors and learners to find the most up-to-date resources.(should link to doc)

Desired State

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Contributor Guide and Resources

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