Add docs for autoscaling feature

[janakimeyyappan]

Add documentation for autoscaling feature in NGINXaaS for GCP

[github-actions]

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[JTorreG]

@janakimeyyappan can you review the current template for how-tos and make sure your new document is following the guidance? https://github.com/nginx/documentation/tree/main/templates/how-to

Then let us know to start the review.

[janakimeyyappan]

@janakimeyyappan can you review the current template for how-tos and make sure your new document is following the guidance? https://github.com/nginx/documentation/tree/main/templates/how-to

Then let us know to start the review.

@JTorreG per offline discussion we are removing this page and adding info about this feature to existing pages.