Update docs.yml

Author: sahilsuman933

fern/docs.yml

@@ -382,6 +382,10 @@ navigation:
             href: https://api.vapi.ai/api-json
 
 redirects:
+  - source: /customization/knowledgebase
+    destination: /knowledgebase
+  - source: /developer-documentation
+    destination: /introduction
   - source: /documentation/general/changelog
     destination: /changelog
   - source: /api-reference/assistants/create-assistant