feat: update icons

Signed-off-by: Luka Trovic <luka@nextcloud.com>

Readme.md

@@ -1,3 +1,3 @@
-# Welcome to Nextcloud! <EFBFBD> ☁️ <20> 
+# Welcome to Nextcloud! 📱 ☁️ 💻
 
 Here you can add a description or any other info relevant for the folder. It will show as a "Readme.md" and in the web interface also embedded nicely up at the top.