docs: update link to Piper

argoproj / argo-workflows

Workflow Engine for Kubernetes

https://argo-workflows.readthedocs.io/

Apache License 2.0

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Closed agilgur5 closed 2 weeks ago

agilgur5 commented 2 weeks ago

Fixes #12613, related to #13033

Piper is at a new URL / repo per its README

update Piper's links in README.md and docs/REAMDE.md

make docs passes