feat: add new golang script generatig examples doc on website

[kennygt51]

Add a Go script that automatically generates website documentation
from example directories. The script reads examples.config.yaml to
determine which examples to process and generates Docusaurus-compatible
markdown files with frontmatter and tabbed manifest file displays.

The following is the sample docs generated by script:

This PR, as an MVP, targets the Go script and two examples (examples/s3-buckets and kubernetes/saas-multi-tenant) for automatic generation. The script is executed locally before creating the PR.

Next steps:

• Update the script so that it can generate other examples as well.
• delete existing update-docs.sh
• Run on the CI (Add go run go run scripts/generate-examples-doc.go to deploy-docs.yaml)

[k8s-ci-robot]

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[k8s-ci-robot]

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