add link to new post

Author: gordonwoodhull

docs/blog/posts/2026-03-24-1.9-release/index.qmd

@@ -38,7 +38,7 @@ Quarto 1.9 brings substantial improvements to Typst output:
 - New options: `mathfont`, `codefont`, `linestretch`, `linkcolor`, `citecolor`, `filecolor`, `thanks`, and `abstract-title`.
 - [Theorem styling](/docs/output-formats/typst.qmd#theorems) with four appearance options: `simple`, `fancy`, `clouds`, or `rainbow`.
 
-We'll have a detailed blog post on all the Typst improvements soon.
+See [this blog post](/docs/blog/posts/2026-03-31-typst-books-and-more/index.qmd) for details on all the Typst improvements.
 
 ## PDF Accessibility (Experimental)