Enhance index.html and custom.css for improved content presentation and new assets

- Updated index.html to refine content structure, including enhanced blockquotes and lists for better readability.
- Added a new section to emphasize Kubernetes as a developer-centric tool.
- Improved CSS styles in custom.css for blockquote presentation and slide layout adjustments.
- Introduced new SVG and WEBP images for better visual representation of tools used in Kubernetes.

content/kubernetes-hell-to-heaven/img/helmsh-icon.svg

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