Remove dependency on unix package

app/decker.hs

resource/deck-old.html

resource/deck.html

resource/support/katex-0.6.0/README.md

resource/support/katex-0.6.0/contrib/auto-render.min.js

resource/support/katex-0.6.0/fonts/KaTeX_AMS-Regular.eot

resource/support/katex-0.6.0/fonts/KaTeX_AMS-Regular.ttf

resource/support/katex-0.6.0/fonts/KaTeX_AMS-Regular.woff

resource/support/katex-0.6.0/fonts/KaTeX_AMS-Regular.woff2

...urce/support/katex-0.6.0/fonts/KaTeX_Caligraphic-Bold.eot

...urce/support/katex-0.6.0/fonts/KaTeX_Caligraphic-Bold.ttf

...rce/support/katex-0.6.0/fonts/KaTeX_Caligraphic-Bold.woff

...ce/support/katex-0.6.0/fonts/KaTeX_Caligraphic-Bold.woff2

...e/support/katex-0.6.0/fonts/KaTeX_Caligraphic-Regular.eot

...e/support/katex-0.6.0/fonts/KaTeX_Caligraphic-Regular.ttf

.../support/katex-0.6.0/fonts/KaTeX_Caligraphic-Regular.woff

...support/katex-0.6.0/fonts/KaTeX_Caligraphic-Regular.woff2

resource/support/katex-0.6.0/fonts/KaTeX_Fraktur-Bold.eot

resource/support/katex-0.6.0/fonts/KaTeX_Fraktur-Bold.ttf

resource/support/katex-0.6.0/fonts/KaTeX_Fraktur-Bold.woff