Update _quarto.yml (#580)

Author: penelopeysm

_quarto.yml

@@ -53,7 +53,7 @@ website:
         - getting-started/index.qmd
         - core-functionality/index.qmd
 
-        - section: "Usage Tips"
+        - section: "User Guide"
           collapse-level: 1
           contents:
             - usage/automatic-differentiation/index.qmd