Feature: Add printable Book layout, print stylesheet and sample chapters (#127)Feature/pdf book

[Arun24-8]

Overview

Adds a printable "Book" layout and supporting print stylesheet for the curriculum guides.

Changes

• Added layouts/_default/book.html
• Added assets/css/book-print.css and print.css
• Added sample content/book/_index.md
• Updated styles for print optimization

Why

This makes the site’s guides printable and lays the groundwork for generating PDFs.

Fixes #127

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[illicitonion]

I took a look at this, and I'm not sure it's quite solving the right problem here.

We want to make it so that all of the existing content of the course can easily be printed. So on the org-cyf-itp site you could easily generate a PDF that contains each of the modules, all of the prep and backlogs and dayplans for each sprint, etc.

This looks like it's instead creating a new section of the guides repo which adds brand new (placeholder) content.

Ideally e.g. if I go to https://deploy-preview-1636--cyf-programming.netlify.app/book/ it would show the whole course as one page (either as HTML that will print conveniently to a PDF, or as a PDF itself generated at build time).

[Arun24-8]

“Hi! My PR’s deploy preview (#1636) is pending review in Netlify (cyf-piscine). Could someone please approve it so I can verify the Book layout changes?”

[illicitonion]

All of our sites work the same. I allowed one of the deploy previews (see #1636 (comment)) which you can use, but I'd recommend developing locally and verifying things there (see instructions in https://github.com/CodeYourFuture/curriculum/blob/main/CONTRIBUTING.md) rather than trying to iterate on GitHub.