Add overwrittable variable to change path to fonts directory

[gebeto]

It is useful for build bundles with webpack or other package managers, if you want to create your own CSS bundle that will consist many css libraries, you can use file-loader

{
  test: /\.(ttf|otf|eot|svg|woff)/,
  use: [{
    loader: 'file-loader',
    options: {
      name: '[name].[ext]',
      outputPath: 'fonts/',		// where the fonts will go
      publicPath: './fonts/'		// override the default path
    }
  }]
}

in your main SCSS file you need to overwrite $devicons-file-path variable, then build will success

Build result without overwriting fonts path:

Main SCSS file with overwritten $devicons-file-path variable:

Build result:

Result is a sindle bundle that consist font-awesome and devicons (and my additional styles):

And it's work!