Merge branch '21-pwa-screenshots' into 'main'

Resolve "Richer PWA Install UI won't be available on desktop. Please add at least one screenshot with "form_factor" set to "wide""

Closes #21

See merge request htwk-software/htwkalender-pwa!15

frontend/vite.config.ts

@@ -48,16 +48,10 @@ export default defineConfig({
             },
             {
                 src: "/390x844.png",
-                sizes: "390x844",
+                sizes: "1170x2532",
                 form_factor: "narrow",
                 type: "image/png",
             },
-            {
-                src: "/640x320.png",
-                sizes: "640x320",
-                form_factor: "wide",
-                type: "image/png",
-            },
         ],
         icons: [
           {