[8.16](backport #4633) Serverless - crop images that show old navigat…

…ion (#4638)

* Crop images (#4633)

(cherry picked from commit 1899119)

# Conflicts:
#	docs/en/serverless/images/cases.png
#	docs/en/serverless/images/entity-detailed-view.png
#	docs/en/serverless/images/inventory-catalog.png
#	docs/en/serverless/images/observability-cases-settings.png
#	docs/en/serverless/images/quickstart-k8s-otel-dashboard.png
#	docs/en/serverless/images/quickstart-k8s-overview.png

* Delete docs/en/serverless directory

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Co-authored-by: Arianna Laudazzi <46651782+alaudazzi@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>