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Introduce an examples accordion within the Gradio application to provide users with
a selection of sample PDFs for demonstration purposes. The added functionality allows
users to quickly test the PDF conversion feature with various document types.

Removed the previously used gradio and gradio-pdf imports which were not leveraged in the code. Also,
replaced the custom `show_pdf` function with direct use of the `PDF` component from gradio for a simpler
and more integrated PDF upload and display solution, improving code maintainability and readability.