[ADF-2463] Moved user guide pages to a subfolder (#3083)

* [ADF-2463] Moved user guide to a subfolder

* [ADF-2463] Fixed broken links and images

docs/core/form-field.model.md

@@ -60,7 +60,7 @@ You will need to use the properties of `FormFieldModel` if you want to implement
 custom widgets. Aside from the `value` property (which contains the data value entered into
 the field), there are also a few other fields that are used for specific types of data. For
 example, the `currency` property holds the currency symbol to be displayed next to the value
-(such as the dollar sign $) and the `dateDisplayFormat` defines how the elements of a date/time will be arranged. See the [Form Extensibility and Customization](../extensibility.md) for more information about creating custom widgets.
+(such as the dollar sign $) and the `dateDisplayFormat` defines how the elements of a date/time will be arranged. See the [Form Extensibility and Customization](../user-guide/extensibility.md) for more information about creating custom widgets.
 
 ### Validation
 
@@ -93,7 +93,7 @@ contains full details about how the REST calls work, along with a worked example
 
 ## See also
 
--   [Extensibility](../extensibility.md)
+-   [Extensibility](../user-guide/extensibility.md)
 -   [FormFieldValidator](form-field-validator.interface.md)
 -   [Form rendering service](form-rendering.service.md)
 -   [Form component](form.component.md)

docs/core/form-rendering.service.md

@@ -90,11 +90,11 @@ formRenderingService.setComponentTypeResolver('text', newResolver, true);
 
 You would typically use this to replace an existing widget with your own custom version that
 implements a modified layout or responds differently when the data is entered. See the
-[Form Extensibility and Customisation](../extensibility.md) guide for further details and examples
+[Form Extensibility and Customisation](../user-guide/extensibility.md) guide for further details and examples
 of this technique.
 
 ## See also
 
--   [Extensibility](../extensibility.md)
+-   [Extensibility](../user-guide/extensibility.md)
 -   [Form field model](form-field.model.md)
 -   [Form component](form.component.md)

docs/core/form.component.md

@@ -338,6 +338,6 @@ Using the CSS you can target any outcome ID and change the style as in this exam
 ## See also
 
 -   [FormFieldValidator](form-field-validator.interface.md)
--   [Extensibility](../extensibility.md)
+-   [Extensibility](../user-guide/extensibility.md)
 -   [Form rendering service](form-rendering.service.md)
 -   [Form field model](form-field.model.md)

docs/core/language-menu.component.md

@@ -72,4 +72,4 @@ In the previous example we are using the ADF Language Menu as nested menu.
 
 ## See Also
 
--   [Internationalization](../internationalization.md)
+-   [Internationalization](../user-guide/internationalization.md)

docs/core/translation.service.md

@@ -149,4 +149,4 @@ class MyComponent {
 
 ## See Also
 
--   [Internationalization](../internationalization.md)
+-   [Internationalization](../user-guide/internationalization.md)