Download google font files and CSS for self-hosting.
Inspired by: https://github.com/majodev/google-webfonts-helper Updated user agents: https://github.com/majodev/google-webfonts-helper/blob/master/server/logic/conf.js
python google-fonts-downloader.py --output Barlow.zip --family Barlow --weight 300 400 700 --italic --subset latin latin-ext