docs: add /pricing as Ask Fern datasource (#5099)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Devin Logan <devinannlogan@gmail.com>

Author: devin-ai-integration[bot]

fern/docs.yml

@@ -13,6 +13,9 @@ title: Fern Documentation
 ai-search:
   location:
     - docs
+  datasources:
+    - url: https://buildwithfern.com/pricing
+      title: Fern pricing
 
 metadata:
   og:image: https://fern-docs.s3.us-east-2.amazonaws.com/fern-docs-og_image-compressed.png