try this method of turning docs into external links

docs/developer-tools.mdx

@@ -1,6 +1,10 @@
 ---
 sidebar_position: 75
 title: Developer Tools
+sidebar_custom_props:
+  migration:
+    href: https://developers.stellar.org/docs/tools/developer-tools
+    label: Developer Tools
 ---
 
 :::info

docs/reference/sdks/build-your-own-sdk.mdx

@@ -2,6 +2,10 @@
 sidebar_position: 30
 title: Build Your Own SDK
 description: A guide to developing Soroban SDKs for languages other than Rust.
+sidebar_custom_props:
+  migration:
+    href: https://developers.stellar.org/docs/tools/sdks/build-your-own
+    label: Build Your Own SDK
 ---
 
 Soroban currently has one SDK for writing contracts in Rust, which can be found [here][soroban-sdk].

docs/reference/sdks/interact-with-contracts.mdx

@@ -2,6 +2,10 @@
 sidebar_position: 20
 title: Interact with Contracts
 description: SDKs support writing Soroban applications in many languages.
+sidebar_custom_props:
+  migration:
+    href: https://developers.stellar.org/docs/tools/sdks/library
+    label: Interact with Contracts
 ---
 
 ## JavaScript SDK

docs/reference/sdks/write-contracts.mdx

@@ -2,6 +2,10 @@
 sidebar_position: 10
 title: Write Contracts
 description: SDKs support writing Soroban contracts in Rust and AssemblyScript.
+sidebar_custom_props:
+  migration:
+    href: https://developers.stellar.org/docs/tools/sdks/library
+    label: Write Contracts
 ---
 
 ## Soroban Rust SDK

src/sidebar-generator.js

@@ -1,6 +1,24 @@
 const fs = require('fs')
 const path = require('path')
 
+const migrationLinksRecursive = (sidebarItems) => {
+    const result = sidebarItems.map((sidebarItem) => {
+        if (sidebarItem.type === 'category') {
+            return {...sidebarItem, items: migrationLinksRecursive(sidebarItem.items)}
+        }
+
+        if (sidebarItem.customProps?.migration?.href && sidebarItem.customProps?.migration?.label) {
+            sidebarItem = {
+                type: 'link',
+                href: sidebarItem.customProps.migration.href,
+                label: sidebarItem.customProps.migration.label,
+            }
+        }
+        return sidebarItem
+    })
+    return result
+}
+
 module.exports = async ({ defaultSidebarItemsGenerator, ...args }) => {
 
     if (args.version.contentPath.endsWith('docs')) {
@@ -31,5 +49,5 @@ module.exports = async ({ defaultSidebarItemsGenerator, ...args }) => {
     }
 
     const sidebarItems = await defaultSidebarItemsGenerator({ ...args })
-    return sidebarItems
+    return migrationLinksRecursive(sidebarItems)
 }