Fixed links and navigation

Author: mnocon

docs/discounts/discounts_guide.md

@@ -87,7 +87,7 @@ The discount data is split into two parts:
 
 #### Target groups
 
-With discounts, you can target your entire customer base or only a subset of it belonging to specified [customer groups](customer_group.md).
+With discounts, you can target your entire customer base or only a subset of it belonging to specified [customer groups](customer_groups.md).
 
 #### Product selection
 

mkdocs.yml

@@ -589,18 +589,6 @@ nav:
             - RangeMeasurementAttributeMaximum: search/criteria_reference/rangemeasurementattributemaximum_criterion.md
             - SimpleMeasurementAttribute: search/criteria_reference/simplemeasurementattribute_criterion.md
             - SelectionAttribute: search/criteria_reference/selectionattribute_criterion.md
-        - Discount Search Criteria: 
-            - Discount Search Criteria: search/criteria_reference/discount_search_criteria.md
-            - CompanyName: search/criteria_reference/order_company_name_criterion.md
-            - CreatedAt: search/criteria_reference/order_created_criterion.md
-            - CurrencyCode: search/criteria_reference/order_currency_code_criterion.md
-            - CustomerName: search/criteria_reference/order_customer_name_criterion.md
-            - Identifier: search/criteria_reference/order_identifier_criterion.md
-            - IsCompanyAssociated: search/criteria_reference/order_company_associated_criterion.md
-            - Owner: search/criteria_reference/order_owner_criterion.md
-            - Price: search/criteria_reference/order_price_criterion.md
-            - Source: search/criteria_reference/order_source_criterion.md
-            - Status: search/criteria_reference/order_status_criterion.md
         - Order Search Criteria: 
             - Order Search Criteria: search/criteria_reference/order_search_criteria.md
             - CompanyName: search/criteria_reference/order_company_name_criterion.md