Reorganize SDK Deep dives section into smaller sections

fern/products/sdks/sdks.yml

@@ -9,6 +9,11 @@ navigation:
       - page: Quickstart
         path: ./fern-folder.mdx
         slug: quickstart
+      - link: Customer showcase
+        href: https://buildwithfern.com/showcase
+  - section: Working with SDKs
+    slug: overview
+    contents:
       - page: Project structure
         path: ./project-structure.mdx
         slug: project-structure
@@ -21,8 +26,6 @@ navigation:
       - page: Fern Autorelease
         path: ./autorelease.mdx
         slug: autorelease
-      - link: Customer showcase
-        href: https://buildwithfern.com/showcase
   - section: Generators
     contents:
       - section: TypeScript
@@ -226,41 +229,58 @@ navigation:
           - page: Publishing to Postman
             path: ./overview/postman/publishing-to-postman.mdx
             slug: publishing
-  - section: Deep dives
-    contents:    
+  - section: SDK design
+    slug: deep-dives
+    collapsed: true
+    contents:
       - page: SDK user features
         path: ./guides/generated-sdk.mdx
+        slug: sdk-user-features
+      - page: Customize your README
+        path: ./guides/configure-readme.mdx
+        slug: readme
       - page: Customize method names
         path: ./guides/customize-method-names.mdx
         slug: customize-method-names
-      - page: Setup local SDK previews
-        path: ./guides/setup-local-sdk-previews.mdx
-        slug: local-previews
-      - page: Configure global headers
+      - page: Filter endpoints by audience
+        path: ./guides/filter-your-endpoints-audiences.mdx
+        slug: audiences
+  - section: Request behavior
+    slug: deep-dives
+    collapsed: true
+    contents:
+      - page: Global headers
         path: ./guides/configure-global-headers.mdx
         slug: global-headers
       - page: Dynamic authentication
         path: ./guides/dynamic-authentication.mdx
         slug: dynamic-authentication
-      - page: Configure auto-pagination
+      - page: Auto-pagination
         path: ./guides/configure-auto-pagination.mdx
         slug: auto-pagination
-      - page: Configure idempotency
+      - page: Idempotency headers
         path: ./guides/configure-idempotency.mdx
         slug: idempotency
-      - page: Filter your endpoints (audiences)
-        path: ./guides/filter-your-endpoints-audiences.mdx
-        slug: audiences
-      - page: Customize your README
-        path: ./guides/configure-readme.mdx
-        slug: readme
-      - page: Retries with Backoff
+      - page: Retries with backoff
         path: ./guides/retries-with-backoff.mdx
+        slug: retries-with-backoff
+  - section: Preview & testing
+    slug: deep-dives
+    collapsed: true
+    contents:
+      - page: Local SDK previews
+        path: ./guides/setup-local-sdk-previews.mdx
+        slug: local-previews
+      - page: Testing
+        path: ./guides/testing.mdx
+        slug: testing
+  - section: Hosting
+    slug: deep-dives
+    collapsed: true
+    contents:
       - page: Self-hosted SDKs
         path: ./guides/self-hosted.mdx
         slug: self-hosted
-      - page: Testing
-        path: ./guides/testing.mdx
   - section: Reference
     contents: 
       - page: generators.yml