use only woff and woff2

All current browsers support woff and woff2, the others are not needed. These are often also much bigger and have less features (kerning and so on):

https://github.com/matcornic/hugo-theme-learn/tree/master/static/fonts

https://caniuse.com/woff
https://caniuse.com/woff2

Also there should be only woff2 and woff be loaded (in this order):

hugo-theme-learn/static/css/theme.css

Line 25 in 6cfd61e

    
           src: url("../fonts/Novecentosanswide-UltraLight-webfont.eot?#iefix") format("embedded-opentype"), url("../fonts/Novecentosanswide-UltraLight-webfont.woff2") format("woff2"), url("../fonts/Novecentosanswide-UltraLight-webfont.woff") format("woff"), url("../fonts/Novecentosanswide-UltraLight-webfont.ttf") format("truetype"), url("../fonts/Novecentosanswide-UltraLight-webfont.svg#novecento_sans_wideultralight") format("svg");

See https://github.com/DanielRuf/daniel-ruf.de/blob/ee1eeb4d567b929d77736445b6568574c2aa2f38/index.html#L22-L28

cc @McShelby