Add PDF download functionality to landing page

[devin-ai-integration]

Add PDF download functionality to landing page

Summary

Added a "Download PDF" button to the documentation landing page (buildwithfern.com/learn/home) that allows users to save the page as a PDF using their browser's print dialog. The implementation includes:

• New pdf-download.js script that dynamically adds a download button to the hero section
• Print-optimized CSS styles that hide navigation, animations, and other non-content elements
• Auto-initialization that works with the site's SPA navigation
• Button only appears on the /home route as requested

The solution uses the browser's native window.print() API, which opens the print dialog where users can select "Save as PDF" as the destination.

Review & Testing Checklist for Human

This PR has moderate risk due to limited automated testing capabilities. Please verify:

• Test the actual PDF generation flow: Click the "Download PDF" button and verify the print dialog opens correctly, then save as PDF and review the output quality in Chrome, Firefox, and Safari
• Review PDF print styles: Check that the generated PDF properly hides navigation/header/footer, maintains readable formatting, and handles page breaks appropriately
• Verify button UX: The button currently says "Generating PDF..." but really just opens the print dialog - confirm this messaging is acceptable or if it should say "Print Page" instead
• Check responsive behavior: Test that the button displays correctly on mobile/tablet viewports and that the print styles work on smaller screens
• Confirm scope matches requirements: I interpreted "start by just adding one page to the PDF which is the landing page or the first guide" to mean adding a button to the landing page only. If you wanted the button on other pages or a multi-page PDF export, let me know and I can extend this.

Notes

• The implementation is scoped to only the /home route to keep the initial rollout contained
• URLs are appended to links in the printed version (can be adjusted if too cluttered)
• The print styles hide Rive animations and canvas elements since they don't render well in PDFs
• This can be extended to other pages by modifying the path check in addPdfDownloadButton()

Link to Devin run: https://app.devin.ai/sessions/0b901c6bca8e4a429dc8f15595515048
Requested by: Deep Singhvi (@dsinghvi)

[devin-ai-integration]

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