fix: add compact mobile menu presentation

exampleSite/content/docs/configuration/index.md

@@ -228,6 +228,7 @@ Many of the article defaults here can be overridden on a per article basis by sp
 | Name | Default | Description |
 | --- | --- | --- |
 | `header.layout` | `"basic"` | Defines the header for the entire site, supported values are `basic`, `fixed`, `fixed-fill`, `fixed-fill-blur`, `fixed-gradient`, and `floating`. |
+| `header.mobileMenuStyle` | `"fullscreen"` | Defines the mobile menu presentation. Set to `"dropdown"` for a compact menu anchored below the header. |
 | `list.featureImageHover` | `false` | Adds a subtle zoom transition when a visitor hovers a post or related-content card. Individual pages can override this with `featureImageHover` in front matter. |
 
 ### Footer