Fix: Remove directly import of font-family in root

[GabriellReis14]

This adjustment prevents discrepancies when you need to change the font.

Before, if you changed only the $fontFamily variable, it was not considered, as it was imported directly into :root.

[melloware]

Nice

[mertsincan]

This has been rolled back as it breaks all styles in the core build. We can think of a different solution.