TODO: use some from
https://www.chessvariants.com/graphics.dir/alfaerieSVG/

SVG standard images found on chesstempo website:
https://www4.chesstempo.com/images/pieces/svg/merida/whitepawn.vers1.svg (...)
+ Adaptation for checkered pieces
Some fairy pieces found on the web and icon scout: https://iconscout.com/
PNG images for Eightpieces from https://greenchess.net/index.php and Jeff Kubach design.
Images of the Hawk and Elephant were designed by "Couch Tomato #2218" on Discord,
for the pychess-variants website (http://pychess-variants.herokuapp.com/)
He also designed all the Horde pieces in Orda, the Shako Cannon and Elephant,
the Synochess and Empire pieces, the black Colorbound + Sittuyin pieces set,
and he sent me the wizard and champion SVG files as well (modified from Wikipedia).
He also designed pieces for the CWDA armies.
Letter D: https://svgsilh.com/image/2051714.html
Mammoth: https://www.flaticon.com/free-icon/mammoth_925138
Castle icon: https://www.flaticon.com/free-icon/castle_89009