Add v0.15.0 links to docs and examples

[afrittoli]

Changes

Add v0.15.0 links to docs and examples

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes tests (if functionality changed/added)
• Includes docs (if user facing)
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Release Notes

NONE

/kind documentation
/cc @vdemeester

[chmouel]

/lgtm

Looking Good! 🤙🏽

[vdemeester]

/lgtm

[tekton-robot]

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