FatBinPkg: Remove FatBinPkg and refresh document

FatBinPkg: Remove FatBinPkg and refresh document

Remove FatBinPkg and refresh Maintainers.txt.
https://bugzilla.tianocore.org/show_bug.cgi?id=1105

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Andrew Fish <afish@apple.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>