fix: examples now populate image + always-enabled submit

fix: explicit text color in story and disclaimer boxes (dark theme)

add February 2025 date to competition story

redesign: professional UI, competition story, better layout

fix: remove Dockerfile — switch to Gradio SDK (fixes 30min startup timeout from Docker build)

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Delete plot.jpg

Rename 5352676024720156534.jpg to plot.jpg

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Delete skin_disease_model_jit.pt

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Rename 5309843393913942566.jpg to example2.jpg

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