Remove old bs migration guide from latest docs

Author: fhammerschmidt

_blogposts/2020-08-10-bucklescript-is-rebranding.mdx

@@ -61,7 +61,7 @@ There's no dedicated name for the syntax anymore. It's simply called the ReScrip
 
 **Will there be a migration script to gradually convert our code to the new syntax?**
 
-Yes. See our [migration page](/docs/manual/latest/migrate-from-bucklescript-reason). You can mix and match old and new code for a smoother transition.
+Yes. See our [migration page](/docs/manual/v10.0.0/migrate-from-bucklescript-reason). You can mix and match old and new code for a smoother transition.
 
 **Will BuckleScript (now ReScript) break my existing code?**
 

data/sidebar_manual_latest.json

@@ -3,7 +3,6 @@
     "introduction",
     "installation",
     "editor-plugins",
-    "migrate-from-bucklescript-reason",
     "try"
   ],
   "Language Features": [

next.config.mjs

@@ -88,6 +88,11 @@ const config = {
         destination: "/blog/bucklescript-is-rebranding",
         permanent: true,
       },
+      {
+        source: "/docs/manual/latest/migrate-from-bucklescript-reason",
+        destination: "/docs/manual/v10.0.0/migrate-from-bucklescript-reason",
+        permanent: true,
+      },
     ];
   },
 };