Git.io deprecation notice

[npmmirror]

Hello, I've found that some of your files in this repo is still using https://git.io/, and this service will be discontinued in the future. (ref: Git.io deprecation)
Theses files are: scripts/docgen-compat/theme/assets/css/main.css

This is an automated message from NPMMirror(https://github.com/npmmirror), a bot developed by Nova Kwok(https://github.com/n0vad3v).

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[hsubox76]

The line in question is

firebase-js-sdk/scripts/docgen-compat/theme/assets/css/main.css

Line 11 in 168b87c

It's a comment in a CSS file that explains where the CSS code was copied from. The url is not used in the code itself. We can update it to point to another source for this normalize.css file but it's not urgent.