Move What's New pages to cura-binary-data

These images are binary data, usually quite big and change often. We don't want to make the Git checkout unnecessarily huge with this. We'll put those properly in cura-binary-data.
The HTML files are not really binary, but they belong together so it's easy to administer them if they are in the same repository.

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-<h4>Improve first time right – with Ultimaker print profile optimizations</h4>
-<p>As a result of countless hours of print process optimizations by our materials and software engineers – we’ve packed Ultimaker Cura 4.12 with quality improvements for Ultimaker print profiles. This increases first-time-right results by improving default top surface and horizontal print quality. Start your print and try it out!</p>

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-<h4>New lightning infill</h4>
-<p>We’ve released a new infill type! The new lightning infill setting lets you to print high-quality top layers but is optimized to use less material and increase your production speed – perfect for visual models. Special thanks to GitHub users rburema and BagelOrb!</p>

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-<h4>New app switcher</h4>
-<p>The new app switcher provides a simpler way to navigate and use other Ultimaker applications, including Ultimaker Digital Factory, Ultimaker Marketplace, and Ultimaker 3D Printing Academy. Reporting bugs to Github is now just one click away, and it’s easier to find the application you need.</p>

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-<h4>Try Ultimaker Essentials for free</h4>
-<p>Since April, we’ve deployed new functionality every 2 weeks to Ultimaker Digital Factory. This includes maintenance scheduling and an unlimited print job history. If you’re using an Ultimaker 3D printer, <a href="https://ultimaker.com/software/ultimaker-essentials?utm_source=cura&utm_medium=software&utm_campaign=whatsnew-4-12-essentialspage">register</a> for Ultimaker Essentials for free. There’s nothing to lose. And so much to gain for your slicing experience.</p>

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-<h4>Never a better time to buy Ultimaker</h4>
-<p>Want to unlock all the benefits of the Ultimaker platform? For a limited time, get at least 20% off a full Ultimaker 3D printing setup to access easy remote printing, native CAD import, your own digital parts library, and more! <a href="https://ultimaker.com/anniversary-value-pack?utm_source=cura&utm_medium=software&utm_campaign=whatsnew-4-12-q4promo-cta">Click here to discover how much you could save</a> </p>

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-<h4>Academy: Beginner’s guide to FFF</h4>
-<p>Ready to dive into FFF printing but don’t know where to start? From A for “Applications” to Z for “Z-screw lubrication”, our newest free Ultimaker Academy course <a href="https://academy.ultimaker.com/lms/index.php?r=course/deeplink&course_id=244&generated_by=13028&hash=42c45e7e294dcc50f1842f470a78801943491771">Beginner’s guide to FFF</a> has you covered. Then, get extra kudos by sharing it with your colleagues and friends.</p>