fix: remove katex styling import inside mathematics extension

[phyohtetarkar]

This pull request resolves #432 by removing KaTex styling import inside mathematics extension. Instead, KaTex css must be explicitly imported inside root layout if mathematics extension is used.

Example:

import "@/styles/globals.css";
import "@/styles/prosemirror.css";

// KaTex styling import
import 'katex/dist/katex.min.css';

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