📖 docs: add missing operator quick start guide

[maxsxu]

What type of PR is this?

/kind documentation

Which issue(s) this PR fixes :
Fixes #5556

Special notes for your reviewer:

Reusing the https://cluster-api.sigs.k8s.io/user/quick-start-operator

I've verified locally via make serve as shown below:

Checklist:

• squashed commits
• includes documentation
• includes emoji in title
• adds unit tests
• adds or updates e2e tests

Release note:

NONE

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @maxsxu. Thanks for your PR.

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[richardcase]

/ok-to-test

[maxsxu]

Thanks @richardcase do you think we're good to merge?

This is pure docs so should not affect any E2E tests.

[richardcase]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 110074fb7fd43a7cdeb72307bc79a1ef5c3f19a2

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: richardcase

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[maxsxu]

The AWS Account for CI has reached the maximum number of VPCs.

E0626 13:41:15.990138   45924 awscluster_controller.go:333] "failed to reconcile network" err="failed to create new managed VPC: failed to create vpc: The maximum number of VPCs has been reached"

---

Note: we should update the CI config, there is no need to run CI against PR which only contain docs change.

[damdo]

/test pull-cluster-api-provider-aws-test