Fimir background removed

After some discussion with the original writer of Warpstone Magazine's Fimir article, I have decided to remove the current Fimir background from the book. Instead, the background will be rewritten to something more in line with 8th edition.

Note that this a project rather far down the line, probably some time next year, as there are other books that need a lot more attention rules-wise. The Fimir rules are still up and can be downloaded if you intend to play the army, but if you want to read about their history and society until then, you will have to get Warpstone Magazine #25.