update manifest with theme color

Author: mireille-raad

Diff for: manifest.webmanifest

@@ -3,9 +3,6 @@
   "short_name": "RustPython",
   "start_url": ".",
   "display": "standalone",
-  "background_color": "#F74C00",
-  "description": "An open source Python-3 (CPython >= 3.5.0) Interpreter written in Rust 🐍 😱 🤘",
-  "icons":[
-    {"src":"assets/android-chrome-192x192.png","sizes":"192x192","type":"image/png"},
-    {"src":"assets/android-chrome-512x512.png","sizes":"512x512","type":"image/png"}]
+  "theme_color": "#F74C00",
+  "description": "An open source Python-3 (CPython >= 3.5.0) Interpreter written in Rust 🐍 😱 🤘"
 }