Fix install url in pipelines-in-pipelines README

[jonashackt]

fixes #817

Changes

Replace authenticated nightly release url with the pulblic access url (as also in #816).

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• ✅ Jonas Hecht (cd991ac)

[tekton-robot]

Hi @jonashackt. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[jerop]

thanks @jonashackt

/ok-to-test

[jerop]

@jonashackt could you please sign the CLA?

[jonashackt]

@jonashackt could you please sign the CLA?

Yeah sure, done 🙃

[dibyom]

/lgtm

[tekton-robot]

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Mark the issue as fresh with /remove-lifecycle stale with a justification.
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/lifecycle stale

Send feedback to tektoncd/plumbing.

[dibyom]

/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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