Document: web fonts (woff, woff2)

[jonz94]

Currently, we do have the web fonts format:

• woff format can be found at https://github.com/jonz94/woff-sarasa-gothic-nerd-fonts
• woff2 format can be found at https://github.com/jonz94/woff2-sarasa-gothic-nerd-fonts

But there is no documentation about them.