docs: update auth docs + add new storefront guides (#9020)

* docs: update auth docs + add new storefront guides

* lint content

* fix vale error

* add callback response schema

* Update www/apps/resources/app/commerce-modules/auth/auth-providers/github/page.mdx

Co-authored-by: Stevche Radevski <sradevski@live.com>

* Update www/apps/resources/app/commerce-modules/auth/auth-providers/github/page.mdx

Co-authored-by: Stevche Radevski <sradevski@live.com>

* Update www/apps/resources/app/commerce-modules/auth/authentication-route/page.mdx

Co-authored-by: Stevche Radevski <sradevski@live.com>

* address PR comments

* replace google -> github

* better explanation for refresh token

---------

Co-authored-by: Stevche Radevski <sradevski@live.com>

www/apps/resources/app/architectural-modules/notification/sendgrid/page.mdx

@@ -168,7 +168,7 @@ export default async function productCreateHandler({
         disposition: "attachment or inline attachment",
         id: "id", // only needed for inline attachment
       },
-    ]
+    ],
   })
 }