Remove dep for css-parse

[jnardone]

css-parse is a dumb package. -> https://github.com/reworkcss/css-parse

all it does is:
module.exports = require('css').parse;

It hasn't been updated in 7 years, and it pulls in css anyway, so just pull in css into this library and stop using this. This ALSO lets you move to css version 3.0.0, which fixes some old deprecations.

[vendethiel]

well, it's a holdover from when css-parse was actually parsing CSS, and not just that.

[muuvmuuv]

Yes please move to css directly to remove the deprecation warning from urix which is resolved in the latest css version.

[iChenLei]

Will release a new version later, PR #2554 for this issue.