Only allow globals in clients, fix potential issue and mention in docs

docs/scarpet/api/Overview.md

@@ -6,7 +6,8 @@ Here is the gist of the Minecraft related functions. Otherwise the CarpetScript
 ## App structure
 
 The main delivery method for scarpet programs into the game is in the form of apps in `*.sc` files located in the world `scripts` 
-folder. When loaded (via `/script load` command, etc.), the game will run the content of the app once, regardless of its scope
+folder. In singleplayer, you can also save apps in `.minecraft/config/carpet/scripts` for them to be available in any world. 
+When loaded (via `/script load` command, etc.), the game will run the content of the app once, regardless of its scope
 (more about the app scopes below), without executing of any functions, unless called directly, and with the exception of the
 `__config()` function, if present, which will be executed once. Loading the app will also bind specific 
 events to the event system (check Events section for details).
@@ -40,7 +41,7 @@ running anything in the global scope for a `'player'` scoped app is not recommen
 stay loaded after startup. Otherwise, after reading the app the first time, and fetching the config, server will drop them down. 
 This is to allow to store multiple apps on the server/world and selectively decide which one should be running at 
 startup. WARNING: all apps will run once at startup anyways, so be aware that their actions that are called 
-statically, will be performed once anyways.
+statically, will be performed once anyways. Only apps present in the world's `scripts` folder will be autoloaded.
 *   `'legacy_command_type_support'` - if `true`, and the app defines the legacy command system via `__command()` function,
 all parameters of command functions will be interpreted and used using brigadier / vanilla style argument parser and their type
 will be inferred from their names, otherwise