Do less `files/rm` calls

[TheDiscordian]

Currently when adding a directory files/rm is called for every file, in-case there's an overwrite. Instead we can just call files/rm -r once on the directory, which would ensure there'd be no collisions anyways.

This would cut down the HTTP calls done on large directories significantly.

[TheDiscordian]

Should probably check if the directory is empty before we remove it.