Map downloads as torrent

Found the [full map-pack](https://drive.google.com/drive/folders/16eBcMpkgMTV9mlKxYmNda64X_dmCFdkk) download link on the [installation page](https://www.beyondallreason.info/download#How-To-Install) and it currently directs to a subdirectory ( BAR maps / BYAR-maps ).

Would it be beneficial to have this content accessible as a torrent download? Because I would be willing to create a torrent for them. Note: although all (in this case) BYAR-map map files would be included, you can always choose/select which files you do or you do not want to download in your torrent client. (e.g. a subset of maps)

Looking at a bit longer term, a 'smart' directory layout would be beneficial. Ideally the torrent content would be as static as possible. If a map is updated, a version number in the filename would assist in keeping the files apart. So perhaps multiple map packs would be an idea for the future.

Start by reviewing the installation page's full map-pack link and the current BAR maps / BYAR-maps directory. Determine whether a torrent and a stable map-pack layout with versioned filenames are feasible, then document the chosen approach and what downloads should be available.

Written by the indexing model from the issue text.