[Docs] Need more specific contributing and building instructions.

[simihablo]

Current State

Desired State

---

Contributor Guides and Resources

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

[miacycle]

@zihanKuang maybe this should just be a very short statement that points to your guide in docs.layer5.io.