docs: add a documentation on calculating prices with taxes (#8330)

Add a documentation page on how to calculate a product's prices with taxes in the Product Module's docs.

Closes DOCS-832

www/apps/resources/generated/files-map.mjs

@@ -451,6 +451,10 @@ export const filesMap = [
     "filePath": "/www/apps/resources/app/commerce-modules/product/guides/price/page.mdx",
     "pathname": "/commerce-modules/product/guides/price"
   },
+  {
+    "filePath": "/www/apps/resources/app/commerce-modules/product/guides/price-with-taxes/page.mdx",
+    "pathname": "/commerce-modules/product/guides/price-with-taxes"
+  },
   {
     "filePath": "/www/apps/resources/app/commerce-modules/product/page.mdx",
     "pathname": "/commerce-modules/product"

www/apps/resources/generated/sidebar.mjs

@@ -4279,6 +4279,13 @@ export const generatedSidebar = [
                 "path": "/commerce-modules/product/guides/price",
                 "title": "Get Product Variant Prices",
                 "children": []
+              },
+              {
+                "loaded": true,
+                "isPathHref": true,
+                "path": "/commerce-modules/product/guides/price-with-taxes",
+                "title": "Get Variant Price with Taxes",
+                "children": []
               }
             ]
           },