Add redirect for /customize to /customize/overview

- Fixes issue where /customize path had no redirect
- Ensures users navigating to /customize are directed to the overview page
- Addresses feedback from PR review #8469

Co-authored-by: bdougieyo <[email protected]>

Author: continue[bot]

docs/docs.json

@@ -420,6 +420,10 @@
       "source": "/customization",
       "destination": "/customize/overview"
     },
+    {
+      "source": "/customize",
+      "destination": "/customize/overview"
+    },
     {
       "source": "/customization/overview",
       "destination": "/customize/overview"