[FIXED][BUG][GIT] Repo contains corrupt copy of NeoLemmix Introduction Pack

[namida]

Source code repo for the NL player contains, in a subfolder of "data", a copy of the NeoLemmix Introduction Pack.

Except that this copy is pretty corrupt. I suspect it was converted at an early point in new-formats development, in particular, a point at which there were attempts to trim empty space from terrain pieces, as well as merge duplicates that are just rotated / flipped / etc versions of each other. Because the eventual new-formats releases used untrimmed pieces (this idea was ditched because it was too buggy and, quite honestly, I was just too lazy to fix it), this version of NLI doesn't work on it.

Should either be removed, or replaced with a non-corrupt copy. I have absolutely no preference either way as to which approach is taken.

[Nepster]

In my opinion all packs should have their own repo as they are not a core part of NeoLemmix. So I removed the pack from the git repo.