Update plasma desktop page

assets/sass/plasma-desktop.scss

@@ -9,7 +9,7 @@
   display: flex;
   align-items: center;
   justify-content: center;
-  background-image: url(../../assets/wallpaper3.jpg);
+  background-image: url(/announcements/plasma/5/5.21.0/mk.webp);
   height: 350px;
   background-position: center center;
   background-size: cover;

content/plasma-desktop.md

@@ -8,9 +8,9 @@ description: "Plasma is KDE's desktop environment. Simple by default, powerful w
 type: plasma-desktop
 get: Get Plasma for your device
 buy: Buy a device with Plasma
-plasma_release: About Plasma 5.20
-plasma_release_desc: A massive release, containing improvements to dozens of components, widgets, and the desktop behavior in general.
-plasma_release_title: "Latest Release: Plasma 5.20"
+plasma_release: About Plasma 5.21
+plasma_release_desc: "Plasma 5.21 is all about upgrading the looks and usability of Plasma."
+plasma_release_title: "Latest Release: Plasma 5.21"
 see_announcements: See Announcements
 parts:
   - title: Simple by default

layouts/plasma-desktop/single.html

@@ -21,7 +21,7 @@
   <div class="laptop-with-overlay d-block my-3 mx-auto w-100" style="max-width: 1000px">
     <img class="laptop img-fluid mt-3" src="/content/plasma-desktop/laptop.png" alt="">
     <div class="laptop-overlay">
-      <img class="img-fluid mt-3" src="/announcements/plasma/5/5.20.0/plasma.jpg" alt="{{ i18n "plasma" }} ">
+      <img class="img-fluid mt-3" src="/announcements/plasma/5/5.21.0/plasma-dark.webp" alt="{{ i18n "plasma" }} ">
     </div>
   </div>
 </section>
@@ -50,7 +50,7 @@
       <div class="view">
         <h2>{{ .Params.plasma_release_title }}</h2>
         <p>{{ .Params.plasma_release_desc }}</p>
-        <a href="/announcements/plasma/5/5.20.0" class="breeze-button">{{ .Params.see_announcements }}</a><br />
+        <a href="/announcements/plasma/5/5.21.0" class="breeze-button">{{ .Params.see_announcements }}</a><br />
       </div>
     </div>
   </div>