add two additional redirects for old fern-folder links

Author: devalog

fern/docs.yml

@@ -235,6 +235,12 @@ redirects:
   - source: /learn/sdks/introduction/overview
     destination: /learn/sdks/overview/introduction
     permanent: true
+  - source: /learn/sdks/overview/set-up-the-fern-folder
+    destination: /learn/sdks/overview/quickstart
+    permanent: true
+  - source: /learn/sdks/fern-folder
+    destination: /learn/sdks/overview/quickstart
+    permanent: true
   - source: /learn/sdks/introduction/customer-showcase
     destination: /learn/sdks/customer-showcase
     permanent: true