Marketplace end-to-end guide: Remove inventory section

Author: RichardIrala

guides/custom-marketplace.mdx

@@ -13,7 +13,6 @@ The tools will enable you to perform:
 3. [Marketplace SDK set up](/guides/custom-marketplace#3-marketplace-sdk-set-up): Basic Guide to Configure the Marketplace SDK
 4. [Displaying collections](/guides/custom-marketplace#4-displaying-collections): Retrieve and display the marketplace's available collections.
 5. [Listings and Offers](/guides/custom-marketplace#5-listings-and-offers): Enable users to list tokens for sale or make offers
-6. [(Optional) Inventory](/guides/custom-marketplace#6-inventory-optional): Add a inventory for your users
 
 ## 1. Minting