Add some notice for deploy

[JamesBonddu]

What type of PR is this? /kind documentation

What this PR does / why we need it:

Add some notice for deploy

Which issue(s) this PR fixes: Fixes #144

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[karmada-bot]

Welcome @JamesBonddu! It looks like this is your first PR to karmada-io/dashboard 🎉

[warjiang]

/assign

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: samzong

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