docs(ubuntu): add commands

tools/nginx.sh

@@ -5,4 +5,5 @@
 
 sudo nginx -t # Check syntax
 sudo systemctl reload nginx # Reload nginx
+sudo service nginx restart  # Restart nginx
 sudo ln -s /etc/nginx/sites-available/example.com /etc/nginx/sites-enabled/ # Link website

tools/ubuntu.sh

@@ -5,3 +5,6 @@
 scp /path/to/file user@server:/path/to/destination # Copy file from local to server
 
 df -h # Check the amount of free space
+
+sudo ufw status # Check status
+sudo ufw allow from remote_IP_address to any port 3306 # Allow external ip to access port