fix: Use git.example.com instead of git.fbrns.co for placeholder

As per review feedback, changed all git instance URLs to use
git.example.com as a placeholder since the code will be hosted
on a different instance.

deployment/DEPLOYMENT.md

@@ -30,7 +30,7 @@ ssh user@your-server
 sudo mkdir -p /var/www/bot
 sudo chown -R $USER:$USER /var/www/bot
 cd /var/www/bot
-git clone https://git.fbrns.co/shoko/randebu.git .
+git clone https://git.example.com/shoko/randebu.git .
 ```
 
 ### 2. Setup Backend