katex.min.css:
 - Source: https://github.com/KaTeX/KaTeX
 - MIT License (katex-license.txt)

chess.css:
 - Source: https://github.com/oakmac/chessboardjs/
 - MIT License (inline)

normalize.css:
 - Source: https://github.com/necolas/normalize.css/
 - MIT License (inline)