Add links to 0.6.0 docs

[dibyom]

Changes

Add links to 0.6.0 docs

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)
• Commit messages follow commit message best practices

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dibyom

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[ghost]

/lgtm

[bobcatfish]

hm

I0816 13:41:12.000] ==== RUNNING BUILD TESTS ====
I0816 13:41:12.000] =============================
I0816 13:41:12.008] ----------------------------------------------
I0816 13:41:12.009] ---- Checking links in the markdown files ----
I0816 13:41:12.009] ----------------------------------------------
I0816 13:42:23.513] level=error msg="Deadline exceeded: try increase it by passing --deadline option"

[bobcatfish]

/test pull-tekton-pipeline-build-tests

[bobcatfish]

Opened #1205 about the flakey build tests.