docs: add rolldown guide short link (#19744)

Co-authored-by: 翠 / green <[email protected]>

Author: 2 people

public/_redirects

@@ -7,3 +7,6 @@ https://ja.vitejs.dev/* https://ja.vite.dev/:splat 301!
 /guide/api-vite-environment.html /guide/api-environment 301
 /guide/comparisons /guide/why#how-vite-relates-to-other-unbundled-build-tools 301
 /guide/comparisons.html /guide/why#how-vite-relates-to-other-unbundled-build-tools 301
+
+# short links
+/rolldown /guide/rolldown 301