fix: `cssclasses` was not applied on folder note (index) (#749)

Mara-Li

2024-01-29 16adbd30114bfcc1aaefa851a5a1786787f97a10

 quartz/plugins/transformers/index.ts

@@ -8,3 +8,4 @@
export { OxHugoFlavouredMarkdown } from "./oxhugofm"
export { SyntaxHighlighting } from "./syntax"
export { TableOfContents } from "./toc"
export { HardLineBreaks } from "./linebreaks"