Write What's New page for PETG profiles

Cutting some tape here by writing it myself. Will give Marketing an opportunity to adjust it though.

Contributes to issue CURA-8213.

resources/texts/whats_new/0.html

@@ -1,5 +1,2 @@
-<h4>Seamless workflow with the Digital Library in Ultimaker Digital Factory</h4>
-<p>
-    Now you can open files directly from Digital Library projects. Then, after preparation, quickly and easily export them back. This feature is available for all users with an Ultimaker Essentials, Professional, or Excellence subscription. 
-	<a href="https://ultimaker.com/software/enterprise-software"> Learn more</a>
-</p>
+<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>

resources/texts/whats_new/1.html

@@ -1,3 +0,0 @@
-<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

@@ -1,4 +0,0 @@
-<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/3.html

@@ -1,3 +0,0 @@
-<h4>Learn more</h4>
-<p>Want more information for Ultimaker Cura 4.9?</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>