recommend head over scripts

Author: mbostock

docs/config.md

@@ -164,14 +164,24 @@ An HTML fragment to add to the footer. Defaults to “Built with Observable.”
 
 ## scripts
 
-Additional scripts to add to the head, such as for analytics. Unlike the **head** option, this allows you to reference a local script in the source root.
+Additional scripts to add to the head, such as for analytics. For example, this:
 
 ```js run=false
 export default {
   scripts: [{type: "module", async: true, src: "analytics.js"}]
 };
 ```
 
+Is equivalent to setting the **head** option:
+
+```js run=false
+export default {
+  head: `<script type="module" async src="analytics.js"></script>`
+};
+```
+
+We recommend you use the **head** option instead of this option.
+
 ## base
 
 The base path when serving the site. Currently this only affects the custom 404 page, if any.