Add Gutenberg Style packages in Next.js

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Add Gutenberg Style packages in Next.js

@import "~@wordpress/base-styles/colors";
@import "~@wordpress/base-styles/variables";
@import "~@wordpress/base-styles/mixins";
@import "~@wordpress/base-styles/breakpoints";
@import "~@wordpress/base-styles/animations";
@import "~@wordpress/base-styles/z-index";

@import '~@wordpress/block-library/src/style.scss';
@import '~@wordpress/block-library/src/theme.scss';