Update Content _index.md

[Namanv0509]

Expected Behavior

https://github.com/layer5io/academy-example/blob/master/content/_index.md?plain=1 , Needs to be updated with certification

Screenshots/Logs

Environment

• Host OS: Mac Linux Windows

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Contributor Guide and Resources

• 📚 Instructions for contributing to academy-example
  • academy-template documentation site, example and theme
• 🎨 Wireframes and designs for Layer5 site in Figma (open invite)
• 🙋🏾🙋🏼 Questions: Layer5 Discussion Forum and Layer5 Community Slack