update nav bar

Author: JosiahParry

_quarto.yml

@@ -18,10 +18,12 @@ website:
         href: get-started.qmd
       - text: Documentation
         menu:
+          - text: "Rust crate docs"
+            href: "https://extendr.github.io/extendr/extendr_api/"
+          - text: "rextendr package"
+            href: https://extendr.github.io/rextendr/dev/
           - user-guide/index.qmd
           - intro-rust/index.qmd
-      - text: "API"
-        href: https://extendr.github.io/extendr/extendr_api/
       - text: "Blog"
         href: blog/index.qmd
     right: