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/resources/app/commerce-modules/auth/auth-providers/emailpass/page.mdx

@@ -36,8 +36,8 @@ const modules = {
           config: {
             emailpass: {
               // options...
-            }
-          }
+            },
+          },
         },
       ],
     },
@@ -92,4 +92,4 @@ const modules = {
 
 ## Related Guides
 
-- [How to register a customer using email and password](../../../customer/register-customer-email/page.mdx)
+- [How to register a customer using email and password](../../../../storefront-development/customers/register/page.mdx)