Fix link and manifest kind in README.

[c3y1huang]

What type of PR is this?

/kind cleanup
/kind documentation

What this PR does / why we need it:

• Fix invalid link
• Replace DaemonSet with StatefulSet to be in sync with manifests.
• Replace /tmp with /csi-data-dir to be in sync with manifests.

Which issue(s) this PR fixes:

Fixes #142

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @c3y1huang. Thanks for your PR.

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[c3y1huang]

/assign @saad-ali

[jsafrane]

/ok-to-test

[jsafrane]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: c3y1huang, jsafrane

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