fixes: muly

- strange behaviour with overflow (clip not valid)
- wrong message in quit button
- add icon to splash screen
- tray.remove() > tray.destroy()

client/src/App.css

@@ -7,6 +7,7 @@ body,
 html,
 .App {
   margin: 0px auto;
+  overflow: hidden;
   overflow: clip;
   height: 100vh;
 }