Moved resource definition docs under extensibility

Author: Bart Koelman

docs/usage/resources/resource-definitions.md renamed to docs/usage/extensibility/resource-definitions.md

@@ -119,8 +119,8 @@ GET /articles?filter[caption]=tech&filter=expr:equals(caption,'cooking')) HTTP/1
 
 There are multiple ways you can add custom filters:
 
-1. Implementing `IResourceDefinition.OnApplyFilter` (see [here](~/usage/resources/resource-definitions.md#exclude-soft-deleted-resources)) and inject `IRequestQueryStringAccessor`, which works at all depths, but filter operations are constrained to what `FilterExpression` provides
-2. Implementing `IResourceDefinition.OnRegisterQueryableHandlersForQueryStringParameters` as [described previously](~/usage/resources/resource-definitions.md#custom-query-string-parameters), which enables the full range of `IQueryable<T>` functionality, but only works on primary endpoints
+1. Implementing `IResourceDefinition.OnApplyFilter` (see [here](~/usage/extensibility/resource-definitions.md#exclude-soft-deleted-resources)) and inject `IRequestQueryStringAccessor`, which works at all depths, but filter operations are constrained to what `FilterExpression` provides
+2. Implementing `IResourceDefinition.OnRegisterQueryableHandlersForQueryStringParameters` as described [here](~/usage/extensibility/resource-definitions.md#custom-query-string-parameters), which enables the full range of `IQueryable<T>` functionality, but only works on primary endpoints
 3. Add an implementation of `IQueryConstraintProvider` to supply additional `FilterExpression`s, which are combined with existing filters using AND operator
 4. Override `EntityFrameworkCoreRepository.ApplyQueryLayer` to adapt the `IQueryable<T>` expression just before execution
 5. Take a deep dive and plug into reader/parser/tokenizer/visitor/builder for adding additional general-purpose filter operators

docs/usage/reading/filtering.md

@@ -22,4 +22,4 @@ GET /api/blogs/1/articles?include=revisions&page[size]=10,revisions:5&page[numbe
 
 ## Configuring Default Behavior
 
-You can configure the global default behavior as [described previously](~/usage/options.md#pagination).
+You can configure the global default behavior as described [here](~/usage/options.md#pagination).

docs/usage/reading/pagination.md

@@ -52,5 +52,5 @@ This sorts the list of blogs by their captions and included revisions by their p
 
 ## Default Sort
 
-See the topic on [Resource Definitions](~/usage/resources/resource-definitions.md)
+See the topic on [Resource Definitions](~/usage/extensibility/resource-definitions.md)
 for overriding the default sort behavior.

docs/usage/reading/sorting.md

@@ -41,4 +41,4 @@ When omitted, you'll get the included resources returned, but without full resou
 
 ## Overriding
 
-As a developer, you can force to include and/or exclude specific fields as [described previously](~/usage/resources/resource-definitions.md).
+As a developer, you can force to include and/or exclude specific fields as described [here](~/usage/extensibility/resource-definitions.md).

docs/usage/reading/sparse-fieldset-selection.md

@@ -1,7 +1,7 @@
 
 
 # Resource Hooks
-This section covers the usage of **Resource Hooks**, which is a feature of`ResourceHooksDefinition<T>`. See the [ResourceDefinition usage guide](resource-definitions.md) for a general explanation on how to set up a `JsonApiResourceDefinition<T>`. For a quick start, jump right to the [Getting started: most minimal example](#getting-started-most-minimal-example) section.
+This section covers the usage of **Resource Hooks**, which is a feature of`ResourceHooksDefinition<T>`. See the [ResourceDefinition usage guide](~/usage/extensibility/resource-definitions.md) for a general explanation on how to set up a `JsonApiResourceDefinition<T>`. For a quick start, jump right to the [Getting started: most minimal example](#getting-started-most-minimal-example) section.
 
 > Note: Resource Hooks are an experimental feature and are turned off by default. They are subject to change or be replaced in a future version.
 

docs/usage/resources/hooks.md

@@ -1,7 +1,6 @@
 # [Resources](resources/index.md)
 ## [Attributes](resources/attributes.md)
 ## [Relationships](resources/relationships.md)
-## [Resource Definitions](resources/resource-definitions.md)
 
 # Reading data
 ## [Filtering](reading/filtering.md)
@@ -24,6 +23,7 @@
 
 # Extensibility
 ## [Layer Overview](extensibility/layer-overview.md)
+## [Resource Definitions](extensibility/resource-definitions.md)
 ## [Controllers](extensibility/controllers.md)
 ## [Resource Services](extensibility/services.md)
 ## [Resource Repositories](extensibility/repositories.md)