Stop generating 'normal' CSS files

[ayuhito]

Specification

As an attempt to reduce unnecessary file generation and clutter, as well as follow closer to the import style of Google's Font API, I'm suggesting to completely remove all -normal files in favour of solely keeping them in weight-specific files. The current behaviour for -italic files will remain.

Current:

import fontsource-roboto/400.css // Contains normal AND italics
import fontsource-roboto/400-normal.css // Only normal style
import fontsource-roboto/400-italic.css  // Only italic style

New:

import fontsource-roboto/400.css // Contains only normal style
import fontsource-roboto/400-normal.css // No longer exists
import fontsource-roboto/400-italic.css // Only italic style

Reason

Since the italics style is a very niche selection, it doesn't make sense for it to be included in the default main imports unless specified. Removing the need for specific files for normal style will reduce the file count by a huge margin, reducing the complexity of each package.

For example, Noto Sans JP has 39 CSS files, of which 18 of them are -normal files.

I'd want to implement this breaking change when we have other more impactful breaking changes that we could possibly add. This is just an idea for the future.

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[ayuhito]

Included in the Fontsource v4 release.