[Docs] Clean up `CHANGELOG.md`

[nebula-aac]

Current State

The CHANGELOG.md have multiple commits of the same commits from the releases.

Once we move to single package repo, but still keeping in mind of any other packages that we may need as separate use case, the CHANGELOG.md needs to be updated.

Desired State

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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