feat: updated slug to openapi-definition

Author: Kapil Gowru

fern/docs.yml

@@ -45,7 +45,7 @@ products:
     path: ./products/openapi-def/openapi-def.yml
     icon: fa-regular fa-book
     image: ./images/product-switcher/openapi-def.png
-    slug: openapi
+    slug: openapi-definition
 
   - display-name: Fern Definition
     path: ./products/fern-def/fern-def.yml
@@ -530,10 +530,10 @@ redirects:
 
   # API Definition Introduction redirects
   - source: /learn/api-definition/introduction/what-is-an-api-definition
-    destination: /learn/api-definition/what-is-an-api-definition
+    destination: /learn/openapi-definition/overview
     permanent: true
   - source: /learn/api-definition/introduction/what-is-the-fern-folder
-    destination: /learn/api-definition/what-is-the-fern-folder
+    destination: /learn/sdks/overview/set-up-the-fern-folder
     permanent: true
   - source: /learn/api-definition/introduction/:slug*
     destination: /learn/api-definition/:slug*