docs: added manage tax rates documentation (#3986)

docs/content/modules/taxes/overview.mdx

@@ -82,25 +82,14 @@ Admins can create additional tax rates aside from the default tax rate. They can
 
 Customers can review order edit requests and authorize additional payments if necessary.
 
-<DocCardList colSize={6} items={[
+<DocCardList colSize={4} items={[
   {
     type: 'link',
-    href: '#',
+    href: '/modules/taxes/admin/manage-tax-rates',
     label: 'Admin: Manage Tax Rates',
     customProps: {
       icon: Icons['academic-cap-solid'],
       description: 'Learn how to manage tax rates using Admin APIs.',
-      isSoon: true
-    }
-  },
-  {
-    type: 'link',
-    href: '#',
-    label: 'Admin: Manage Tax Overrides',
-    customProps: {
-      icon: Icons['academic-cap-solid'],
-      description: 'Learn how to manage tax overrides using Admin APIs.',
-      isSoon: true
     }
   },
   {

www/docs/sidebars.js

@@ -950,12 +950,9 @@ module.exports = {
           label: "Admin: Manage Taxes",
         },
         {
-          type: "link",
-          href: "#",
+          type: "doc",
+          id: "modules/taxes/admin/manage-tax-rates",
           label: "Admin: Manage Tax Rates",
-          customProps: {
-            sidebar_is_soon: true,
-          },
         },
         {
           type: "doc",