docs: added customer storefront guides (#7685)

* added customer guides

* fixes to sidebar

* remove old customer registration guide

* fix build error

* generate files

* run linter

www/apps/book/app/basics/modules-and-services/page.mdx

@@ -68,8 +68,8 @@ module.exports = defineConfig({
   modules: {
     helloModuleService: {
       resolve: "./modules/hello",
-    }
-  }
+    },
+  },
 })
 ```
 

www/apps/book/app/basics/scheduled-jobs/page.mdx

@@ -66,9 +66,9 @@ To test out your scheduled job:
 ```js title="medusa-config.js"
 module.exports = defineConfig({
   projectConfig: {
-    redisUrl: REDIS_URL
+    redisUrl: REDIS_URL,
     // ...
-  }
+  },
 })
 ```