[Tests] update docs, avoid redirect and fix dead link

[asherf]

The chart_test.sh was rewritten in go (yay!) so this update reflects that.
see helm/chart-testing#35
@unguiculus FYI

Signed-off-by: Asher Foa asher@asherfoa.com

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[k8s-ci-robot]

Hi @asherf. Thanks for your PR.

I'm waiting for a helm 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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[asherf]

/assign @paulczar

[jlegrone]

Thanks @asherf!

/ok-to-test
/approve

[jlegrone]

/lgtm

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