add Pixie vizier doc

[zirain]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[kurator-bot]

@zirain: The label(s) kind/documentation cannot be applied, because the repository doesn't have them.

In response to this:

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

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[hzxuzhonghu]

/lgtm

[kurator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hzxuzhonghu

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