docs: rearrange user guide (#2127)

* added lists guide

* restructure existing guides

* added new pages after restructuring

* added blank pages + rearranged sidebar

docs/content/user-guide/price-lists/index.md

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+---
+sidebar_position: 1
+---
+
+# Price Lists Overview
+
+In this document, you learn about what price lists are and get an overview of the Pricing page.
+
+## Overview
+
+Price lists are used to add a sale or override the pricing of one or more products based on specific conditions.
+
+Adding a price list on a set of products would change the prices of these products to an amount you set. You can set the start and end dates of these prices.
+
+You can also specify customer groups to which these prices will be applied. For example, you may apply reduced pricing for VIP customers.
+
+---
+
+## View List of Price Lists
+
+You can view the list of available price lists in your ecommerce store by clicking on Pricing from the sidebar menu.
+
+In the list, you can see price list details such as the name, description, and status of the price list.
+
+---
+
+## Learn More About Price Lists
+
+- [Create a Price List](./create.md)
+- [Edit a Price List](./edit.md)
+- [Delete a Price List](./delete.md)