docs: add documentation for migration generate cli tool (#8128)

* docs: add documentation for migration generate cli tool

* changed migrations details in marketplace recipe

* added generated oas files to action

* vale + lint fixes

* don't import from src in medusa-config.js

* fix generate command in recipe

* fix module name

www/apps/book/sidebar.mjs

@@ -164,6 +164,10 @@ export const sidebar = sidebarAttachHrefCommonOptions(
               path: "/advanced-development/data-models/searchable-property",
               title: "Searchable Property",
             },
+            {
+              path: "/advanced-development/data-models/write-migration",
+              title: "Write Migration",
+            },
           ],
         },
         {