[Docs] Topic: Reviewing Designs

#### Current State
This topic is covered on two sites.

1. https://layer5.io/learn/learning-paths/mastering-meshery/introduction-to-meshery/meshery/reviewing-designs.html
2. https://docs.layer5.io/kanvas/designer/comments/

#### Desired State

Digest and coalesce the information between the two sites, making this page robust and complete - https://docs.layer5.io/kanvas/designer/comments/

Ensure that the design review video is embedded / referenced.

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#### Contributor Guide and Resources
- 📚 [Instructions for contributing to documentation](https://github.com/layer5io/docs/blob/master/CONTRIBUTING.md)
- Layer5 documentation [site](https://docs.layer5.io) and [source](https://github.com/layer5io/docs/)
- 🎨 Wireframes and [designs for Layer5 site](https://www.figma.com/file/5ZwEkSJwUPitURD59YHMEN/Layer5-Designs) in Figma [(open invite)](https://www.figma.com/team_invite/redeem/qJy1c95qirjgWQODApilR9)
- 🙋🏾🙋🏼 Questions: [Layer5 Discussion Forum](https://discuss.layer5.io) and [Layer5 Community Slack](http://slack.layer5.io)