Update whats new pages

Update page 0 for petg.
Added the original whats new pages from 4.9 to 4.9.1
CURA-8213

resources/texts/whats_new/0.html

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 <h4>Ultimaker PETG Profiles</h4>
-<p>Profiles have been added for Ultimaker's own PETG filament. It is easy to print, chemically durable and capable of resisting higher temperatures. <a href="https://ultimaker.com/materials/petg">Learn more</a></p>
+<p>Profiles for Ultimaker PETG are now included. Ultimaker PETG sets the standard for industrial applications and is suitable for a wide range of use cases thanks to its ease of use and versatility. <a href="https://ultimaker.com/materials"> Find out more</a></p>

resources/texts/whats_new/1.html

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+<h4>Better visual representation</h4>
+<p>The Z-seam is now clearly indicated in Preview mode. This ensures that you will know whether the seam will be sufficiently hidden in the end product. <br>
+<i>Thanks to BasF0 for contributing to this feature.</i> </p>

resources/texts/whats_new/2.html

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+<h4>Better visual representation</h4>
+<p>The Z-seam is now clearly indicated in Preview mode. This ensures that you will know whether the seam will be sufficiently hidden in the end product. <br>
+<i>Thanks to BasF0 for contributing to this feature.</i> </p>

resources/texts/whats_new/3.html

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+<h4>“Line type” is now the default color scheme.</h4>
+<p>
+    This improves your user experience – as you will no longer have to manually switch to “line type” each time you enter Preview mode.
+</p>

resources/texts/whats_new/4.html

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+<h4>Learn more</h4>
+<p>Want more information for Ultimaker Cura 4.9.1?</br>
+Read the <a href="https://ultimaker.com/learn/ultimaker-cura-4-9-seamless-and-efficient-with-digital-library-integration"> blog post</a> or watch the <a href="https://www.youtube.com/watch?app=desktop&v=q7IJ0I9Mi1I&feature=youtu.be"> video</a>. And don't forget to give us your <a href="https://github.com/Ultimaker/Cura/issues"> feedback</a>!</p>