[Docs] Update Readme

[leecalcote]

Current State

The repo's readme is in its default description and needs converted from "Meshery" to "Kanvas"

Desired State

1. Replace all references to Meshery with Kanvas
2. Find Kanvas logos here: https://layer5.io/brand

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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]

Some updates made. New screenshots needed.

[fitzergerald]

I added a new one.