How to Add Icons to Thunder Font

1. Go to https://www.fluttericon.com/, press the settings wrench, and import config.json from this directory.
2. Select any icons from that website or upload external ones.
3. Press Download in the top-right.
4. Extract the resulting zip file and...
   • Update Thunder.ttf and config.json in this directory.
   • Place thunder_icons.dart in lib/thunder/.