Mark Tekton as a graduated project

[fdegir]

Pre-submission checklist:

Please check each of these after submitting your pull request:

• [ ] Are you only including a repo_url if your project is 100% open source? If so, pick the single best GitHub repository for your project, not a GitHub organization.
• [ ] Does it follow the guidelines for new entries?
• [ ] Have you added an SVG to hosted_logos and referenced it there?
• [ ] Does your logo clearly state the name of the project/product and follow logo guidelines?
• [ ] Have you verified that the Crunchbase data for your organization is correct (including headquarters and LinkedIn)?
• [ ] ~5 minutes after opening the pull request, the CNCF-Bot will post a link for you to preview your changes. Have you confirmed that they are correct and then added a comment to the PR saying "LGTM"?

[netlify[bot]]

✅ Deploy Preview for cdf-landscape ready!

Name	Link
🔨 Latest commit	ea1c94696d247d0c1d6010f00bc414c66a6eb4ef
🔍 Latest deploy log	https://app.netlify.com/sites/cdf-landscape/deploys/6357e63c582baa000792e590
😎 Deploy Preview	https://deploy-preview-267--cdf-landscape.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.