docs: add sidneys artist handbook to showcase

Jacky Zhao

2024-01-13 4e82b0d8ce805ca832e08bafcfe5144e352c2d05

 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"