doc: update doc image

[Xieql]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Corrected spelling mistakes and updated logos/images in various components.

Global Changes:

• Renamed component from fleet-maneger to fleet-manager.
• Replaced integrated third-party tool's logo with fleet-manager logo.
• Replaced fleet-manger logo with kurator logo (previously used the k8s logo).

Specific Changes:

Image: fleet-application

• Added Helm logo to source.

Image: fleet-metric.svg

• Renamed file from fleet-metric.png to fleet-metric.svg.

Image: fleet-policy.svg

• Renamed file from fleet-policy.drawio.svg to fleet-policy.svg.
• Corrected component name from obejct store to object store.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

doc: update doc image

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[hzxuzhonghu]

/lgtm
/approve

[kurator-bot]

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This pull-request has been approved by: hzxuzhonghu

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