css tuning. disallow too large zips

data/config.json.example

@@ -2,7 +2,8 @@
   "__comment": [
     "workers: number of parallel processes. single long upload reserves a process.",
     "timeout: seconds for process to last. single long upload cant take longer than this.",
-    "uid: Docker runs as root, this changes owner of written files. -1 to skip chowning"
+    "uid: Docker runs as root, this changes owner of written files. -1 to skip chowning",
+    "max_zip_size: dont allow zip downloads if folder size exceeds this many megabytes"
   ],
   "workers": 8,
   "timeout": 3600,
@@ -11,6 +12,7 @@
   "data_folder": "data",
   "shares_file": "data/shares.json",
   "zip_folder": "data/.zip",
+  "max_zip_size": 1000,
   "date_format": "%Y-%m-%d %H:%M",
   "debug": false
 }