docs: add chains integration

[osamamagdy]

[osamamagdy]

/cc @ankitm123

[jenkins-x-bot]

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[jenkins-x-bot]

:star: PR built and available in a preview jenkins-x-jx-docs-pr-3660 here

[ankitm123]

- ./tmp-website/v3/develop/supply-chain-security/index.html
--
  |   |   |   | *  internally linking to chains/, which does not exist (line 1469)
  |   |   |   | <a href="chains/">sign tekton artifacts using chains</a>
  |   |   |   | htmlproofer 3.8.0 \| Error:  HTML-Proofer found 1 failure!

[jenkins-x-bot]

:star: PR built and available in a preview jenkins-x-jx-docs-pr-3660 here

[osamamagdy]

/test preview

[jenkins-x-bot]

:star: PR built and available in a preview jenkins-x-jx-docs-pr-3660 here

[sonarqubecloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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[jenkins-x-bot]

:star: PR built and available in a preview jenkins-x-jx-docs-pr-3660 here

[ankitm123]

/hold