certbot text mode

sitegen/sitegen.json

   "letsencryptCommand": "letsencrypt",
   "letsencryptArgs": [
     "--agree-tos",
+    "--text",
     "--renew-by-default",
     "--webroot",
     "--webroot-path",
   ],
   "letsencryptDir": "/etc/letsencrypt/live/",
   "certDir": "/etc/ssl/private/"
-}
+}