New base-64 encoding for woff embeded font

Re-doing the base-64 encoding, now [from the original woff files](https://github.com/mozilla/Fira/tree/master/woff), in order to have ligatures - like in: fi - actually showing up, and not leave a big empty space. Was using [this online tool](http://www.opinionatedgeek.com/dotnet/tools/base64encode/) instead of the webfont-generator by fontsquirrel , which doesn't except woff files as input.