Update changelog and whats new

Update the change log
Update the whats new pages and images

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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>
+<h4>Welcome to the second beta for our Arachne engine!</h4>
+<p>Our new Ultimaker Cura engine allows you to create parts with ground-breaking quality, strength, and speed. This is made possible by fundamentally redefining how the inside of a model is generated – through adaptive line widths and optimized line positioning. <a href="https://ultimaker.com/learn/3d-printing-revolution-continues-second-beta-for-ultimaker-cura-arachne?utm_source=cura&utm_medium=software&utm_campaign=arachne-beta-2">Learn more</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>
+<h4>Share your input</h4>
+<p>We invite you to put Arachne to the test! As always, we rely on your feedback to help us shape it into the best tool it can be for the global 3D printing community. We especially encourage input for print profiles for your preferred 3D printer. <a href="https://github.com/Ultimaker/Cura/discussions/10931">Go to github to provide us all your input!</a> </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>