Center midpage and footer CTA headings (HTML h3 instead of markdown)

Marketing-driven redesign: 3-tier CTA flow (hero/midpage/footer) to app.rundiffusion.com/login, prompting library link, 'try free in browser' positioning, WebP banner

Refresh model card: banner header, social proof, cleaned content, family cross-links, drop stale roadmap and Auto1111 refs

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add pipeline tag (#5)

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Upload StableDiffusionXLPipeline (#1)

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initial commit