[Documentation] Add HPA example to LWS site

[Edwinhr716]

Add a section to the lws site showcasing HPA. Example in codebase is here https://github.com/kubernetes-sigs/lws/blob/main/docs/examples/sample/horizontal-pod-autoscaler.yaml, we can potentially add it in the examples section https://lws.sigs.k8s.io/docs/examples/. Code side of that is here https://github.com/kubernetes-sigs/lws/tree/main/site/content/en/docs/examples

[Edwinhr716]

/help

[k8s-ci-robot]

@Edwinhr716:
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[Edwinhr716]

/good-first-issue

[k8s-ci-robot]

@Edwinhr716:
This request has been marked as suitable for new contributors.

Guidelines

Please ensure that the issue body includes answers to the following questions:

• Why are we solving this issue?
• To address this issue, are there any code changes? If there are code changes, what needs to be done in the code and what places can the assignee treat as reference points?
• How can the assignee reach out to you for help?

For more details on the requirements of such an issue, please see here and ensure that they are met.

If this request no longer meets these requirements, the label can be removed
by commenting with the /remove-good-first-issue command.

In response to this:

/good-first-issue

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[LuyuZhang00]

/assign