[Docs] Deduplicate README.md and Meshery Docs contributing guide

[leecalcote]

Desired State

1. Eliminate redundancy.
2. Consolidate to Meshery Docs.

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Contributor Guides and Handbook

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

[Riya379]

Hi @leecalcote ! I’d like to work on this issue . Could you please assign it to me? Thank You