Add links to 0.13 tagged docs

[ghost]

Changes

We maintain links to the docs of each tagged Pipeline release
in the project's README.

This commit adds links to the 0.13.0 tagged version of the
docs.

Submitter Checklist

• Includes docs (if user facing)
• Commit messages follow commit message best practices

See the contribution guide for more details.

Reviewer Notes

If API changes are included, additive changes must be approved by at least two OWNERS and backwards incompatible changes must be approved by more than 50% of the OWNERS, and they must first be added in a backwards compatible way.

[ghost]

/kind documentation

[tekton-robot]

This PR cannot be merged: expecting exactly one kind/ label

Available kind/ labels are:

kind/bug: Categorizes issue or PR as related to a bug.
kind/flake: Categorizes issue or PR as related to a flakey test
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kind/design: Categorizes issue or PR as related to design.
kind/documentation: Categorizes issue or PR as related to documentation.
kind/feature: Categorizes issue or PR as related to a new feature.
kind/misc: Categorizes issue or PR as a miscellaneuous one.

[tekton-robot]

This PR cannot be merged: expecting exactly one kind/ label

Available kind/ labels are:

kind/bug: Categorizes issue or PR as related to a bug.
kind/flake: Categorizes issue or PR as related to a flakey test
kind/cleanup: Categorizes issue or PR as related to cleaning up code, process, or technical debt.
kind/design: Categorizes issue or PR as related to design.
kind/documentation: Categorizes issue or PR as related to documentation.
kind/feature: Categorizes issue or PR as related to a new feature.
kind/misc: Categorizes issue or PR as a miscellaneuous one.

[vdemeester]

/meow

[tekton-robot]

@vdemeester:

In response to this:

/meow

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[afrittoli]

Thanks!
/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: afrittoli, vdemeester

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• OWNERS [afrittoli,vdemeester]

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[dibyom]

/lgtm

[bobcatfish]

Thanks for taking care of this @sbwsg !!! 🙏