Linking to the framework migration guide (#1097) (#1098)

Author: bendbennett

website/data/plugin-sdk-nav-data.json

@@ -1,6 +1,7 @@
 [
   { "heading": "SDKv2" },
   { "title": "Overview", "path": "" },
+  { "title": "Migrate to the Framework", "href": "https://developer.hashicorp.com/terraform/plugin/framework/migrating" },
   {
     "title": "Schemas",
     "routes": [

website/docs/plugin/sdkv2/index.mdx

@@ -31,6 +31,8 @@ Terraform Plugin SDKv2 is an established way to develop Terraform Plugins on [pr
 
 ## Migrate to Terraform Plugin Framework
 
+Use the [migration guide](/plugin/framework/migrating) to migrate preexisting providers from SDKv2 to the Terraform Plugin Framework.
+
 The [terraform-plugin-framework](/plugin/framework) is a new way to develop Terraform providers, offering improvements and new features from Terraform Plugin SDKv2. You can refactor individual resources and data sources over time with the following compatibility:
 
 * Terraform 0.12 and later: [Combine your provider](/plugin/mux/combining-protocol-version-5-providers) with the framework provider. You will not be able to use [protocol version 6](/plugin/how-terraform-works#protocol-version-6) features.