Update README

revert_v2.py

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+"""REVERT v2: Remove leftover lines 13-15 from gfil Nginx config"""
+import paramiko
+
+JD_HOST = "111.228.37.165"
+JD_USER = "root"
+JD_PASS = "Liudecai110"
+
+LAB_HOST = "216.144.233.14"
+LAB_USER = "root"
+LAB_PASS = "Kt9V72Tx2c48ChikKU"
+
+jd = paramiko.SSHClient()
+jd.set_missing_host_key_policy(paramiko.AutoAddPolicy())
+jd.connect(JD_HOST, port=22, username=JD_USER, password=JD_PASS,
+           timeout=20, banner_timeout=60, allow_agent=False, look_for_keys=False)
+
+# Precisely remove the 3 leftover lines
+revert_cmd = r"""sshpass -p 'Kt9V72Tx2c48ChikKU' ssh -o StrictHostKeyChecking=no root@216.144.233.14 '
+# Remove the 3 leftover lines from robots.txt block
+sed -i "/alias \/var\/www\/gfil-lab\/robots\.txt/d" /etc/nginx/sites-enabled/gfil
+sed -i "/default_type text\/plain/d" /etc/nginx/sites-enabled/gfil
+# Remove the orphan closing brace on its own line after the comment line
+sed -i "/^    }$/d" /etc/nginx/sites-enabled/gfil
+
+echo "=== Final config ==="
+cat -n /etc/nginx/sites-enabled/gfil
+
+nginx -t 2>&1
+if [ $? -eq 0 ]; then
+    systemctl reload nginx
+    echo "SUCCESS: Nginx reloaded, config clean"
+else
+    echo "STILL FAILING"
+fi
+'"""
+stdin, stdout, stderr = jd.exec_command(revert_cmd, timeout=30)
+print(stdout.read().decode())
+jd.close()