Use only TTF and WOFF2 fonts for Lato, only WOFF2 for RobotoSlab Also use different file names for compatibility with packages built against sphinx-rtd-theme 0.2.4.
Replace webpack-style imports with normal ones The ~ syntax is only supported by webpack, which we do not use: https://github.com/webpack-contrib/sass-loader#resolving-import-at-rules
