docs: move Upsales docs to api-integrations directory

- Move upsales.mdx from docs/integrations/all/ to docs/api-integrations/
- Move connect.mdx to docs/api-integrations/upsales/
- Update internal link to /api-integrations/upsales/connect
- Update docs.json navigation path

Addresses PR review feedback to use the new docs directory structure.

Author: frkst

docs/integrations/all/upsales.mdx docs/api-integrations/upsales.mdxdocs/integrations/all/upsales.mdx renamed to docs/api-integrations/upsales.mdx

@@ -66,7 +66,7 @@ Connect to Upsales with Nango and see data flow in 2 minutes.
 
 Nango maintained guides for common use cases.
 
-- [How do I link my account?](/integrations/all/upsales/connect)
+- [How do I link my account?](/api-integrations/upsales/connect)
 Connect your Upsales account using the Connect UI
 
 Official docs: [Upsales API Documentation](https://integration.upsales.com/docs/)

docs/integrations/all/upsales/connect.mdx docs/api-integrations/upsales/connect.mdxdocs/integrations/all/upsales/connect.mdx renamed to docs/api-integrations/upsales/connect.mdx

@@ -37,4 +37,4 @@ Once you have your **API Token**:
 2. Enter your **API Token** in the designated field.
 3. Submit the form, and you should be successfully authenticated.
 
-You are now connected to Upsales.
+You are now connected to Upsales.

docs/docs.json

@@ -795,7 +795,7 @@
               "integrations/all/ukg-ready",
               "integrations/all/unanet",
               "integrations/all/unauthenticated",
-              "integrations/all/upsales",
+              "api-integrations/upsales",
               "integrations/all/unipile",
               "integrations/all/valley",
               "integrations/all/valley-api-key",