docs: refine homepage copy and fix layouts

[chasecadet]

Description of Changes

Description
This PR provides a comprehensive overhaul of the Kubeflow homepage, refining the core messaging, introducing new community callouts, and modernizing the overall component layout.

Key Content Enhancements
Hero Section: Expanded the hero banner subtitle to better articulate the mission of Kubeflow (empowering practitioners to focus on models, not manifests).
Overview Structure: Refined the introductory paragraph to emphasize Platform Engineers' ability to effortlessly control infrastructure while meeting data science needs.
Workloads Section: Capitalized the heading to "What Workloads Run On Kubeflow?" and tightened the component descriptions for Pipeline, Dashboard, KServe, etc.
GenAI Integration: Introduced a brand-new callout section specifically highlighting GenAI use-cases, complete with dedicated navigation buttons to the Kubeflow Blog.
SDK Hyperlink: Added a direct inline navigation link pointing to the official kubeflow/sdk GitHub repository.
Layout & Navigational Cleanup
Motivation
These updates transform the homepage into a cohesive, highly professional landing pad that clearly communicates Kubeflow's modern value propositions (including GenAI) while resolving several UX/rendering bugs present on the current live site.

Related Issues

Closes: #

Related: #

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[jaiakash]

Hi @chasecadet can you please review the DCO and PR title CI for this.

[StefanoFioravanzo]

@chasecadet I like how you are trying to make our mission more explicit. I don't want to comment on specifics about the wording, since that would open an endless discussion. In terms of layout and intent, this is a very good direction!

IMHO I would be very happy to see these changes introduced in the website, and I am sure that we could then iterate more on the wording - which will never be perfect, but we need to start from somewhere.

nit1: I like the PyPI and GH stats, but what about making them smaller inside chips, maybe with a different highlight color, so that they occupy less real estate?

nit2: The paragraph below "An ecosystem of tool AND a cohesive platform" feels a bit like a wall of text. How about trying to reduce it just a little bit and using bold and emphasis to highlight some parts of the text?

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