Include cleanup instructions for after removing a map (#44)

Co-authored-by: Lukas Rieger <[email protected]>

wiki/getting-started/Configuration.md

@@ -28,7 +28,10 @@ The name of those config-files (without the `.conf`-extension) will be the ident
 identifier in your commands to select the map. If you rename a config-file, it will be like creating a new map, since bluemap
 also stores all map-information based on that identifier.
 
-If you want to remove a map, you can just delete it's `.conf` file.
+If you want to remove a map, you can just delete its `.conf` file.  
+After removing the file, and reloading/restarting BlueMap, you may want to delete any of the map's previously rendered map data, which you can do with `/bluemap storages <storage> delete <map>`.  
+On the default file-storage, you can also do that manually by deleting the folder for it, which usually is at `bluemap/web/maps/`.
+
 If you want to add a map, you can create a new `.conf` file in this folder and fill it with the correct information.
 The easiest way is probably to just copy the `.conf` file from the one of the default config-files and edit it to your liking.