[gnome-sudoku] Remove six unused figures from user docs

[Andre Klapper <aklapper src gnome org>]

commit fb21de59fbdc0ce01f288f752f2744d2cece1b41
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Sep 24 14:20:48 2017 +0200

    Remove six unused figures from user docs
    
    They have been unused since the move from Docbook to Mallard in
    65de643eef5189e0ebb25c61bc5fe2a91d08647b

 help/C/figures/Print_Sudokus.png      |  Bin 31906 -> 0 bytes
 help/C/figures/always_show_hint.png   |  Bin 50333 -> 0 bytes
 help/C/figures/error_highlighting.png |  Bin 5457 -> 0 bytes
 help/C/figures/highlighting.png       |  Bin 38156 -> 0 bytes
 help/C/figures/hints.png              |  Bin 881 -> 0 bytes
 help/C/figures/starting.png           |  Bin 20109 -> 0 bytes
 6 files changed, 0 insertions(+), 0 deletions(-)