This is a maintenance commit with no released build.

* Added: `npm run font` command for editing the Fontello icon font. Use it to get started, then start the development server with `npm start` and changes will automatically save when you click `Export Font` from Fontello.
* Changed: The list of Fontello icons is now extracted from our Fontello config file so that it doesn't have to be manually updated.

bin/update_fonts.js

@@ -0,0 +1,24 @@
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+
+const dir = 'styles/fontello';
+
+for(const file of fs.readdirSync(dir)) {
+	if ( file.endsWith('.css') ) {
+		const old_path = path.join(dir, file),
+			new_path = `${old_path.substr(0, old_path.length - 4)}.scss`;
+
+		fs.renameSync(old_path, new_path);
+	}
+}
+
+const config = JSON.parse(fs.readFileSync('fontello.config.json', 'utf8'));
+const icons = config.glyphs.map(x => x.css);
+
+fs.writeFileSync('src/utilities/ffz-icons.js', `'use strict';
+// This is a generated file. To update it, please run: npm run font:update
+/* eslint quotes: 0 */
+
+export default ${JSON.stringify(icons, null, '\t')};`);