get custom fonts working

[DSchau]

Currently failing in the build phase of mdx-deck with

$ mdx-deck build deck.js --webpack webpack.config.js
[mdx-deck] building
[mdx-deck] rendering static html
webpack:///./node_modules/style-loader/lib/addStyles.js?:23
return window && document && document.all && !window.atob;
^

ReferenceError: window is not defined

[DSchau]

See jxnblk/mdx-deck#178

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