Add Testing page to navigation

Author: kgowru

fern/products/sdks/sdks.yml

@@ -18,8 +18,8 @@ navigation:
         slug: capabilities
       - link: Customer Showcase
         href: https://buildwithfern.com/showcase
-      - page: Integration Tests
-        path: ./pages/testing/integration-tests.mdx
+      - page: Testing
+        path: ./overview/typescript/testing.mdx
   - section: Generators
     contents:
       - section: TypeScript