docs(showcase): fix pull request redirect link (#500)

Ben Schlegel

2023-09-22 d93599364a3dd0b46068826cf14ed7b25aa59fc3

 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"