[ADF-4152] Updated folder structure of core docs (#4415)

* [ADF-4152] Moved core library docs into subfolders

* [ADF-4152] Moved core library docs into subfolders

* [ADF-4152] Manual fixes to core doc file links

* [ADF-4152] Further automatic + manual link tidying

docs/core/components/sidebar-action-menu.component.md

@@ -0,0 +1,53 @@
+---
+Title: Sidebar action menu component
+Added: v2.1.0
+Status: Active
+Last reviewed: 2018-11-20
+---
+
+# [Sidebar action menu component](../../../lib/core/layout/components/sidebar-action/sidebar-action-menu.component.ts "Defined in sidebar-action-menu.component.ts")
+
+Displays a sidebar-action menu information panel.
+
+![Sidebar action menu button screenshot](../../docassets/images/sidebar-action-menu-button.png)
+![Sidebar action menu icon screenshot](../../docassets/images/sidebar-action-menu-icon.png)
+
+## Basic usage
+
+### [Transclusions](../../user-guide/transclusion.md)
+
+There are three regions where you can add your own content in `<div>` elements with
+the following names:
+
+-   adf-sidebar-menu-title-icon
+-   adf-sidebar-menu-options
+-   adf-sidebar-menu-expand-icon
+
+```html
+<adf-sidebar-action-menu>
+    <mat-icon adf-sidebar-menu-title-icon>arrow_drop_down</mat-icon>
+    <div adf-sidebar-menu-expand-icon>
+        <mat-icon>queue</mat-icon>
+    </div>
+    <div adf-sidebar-menu-options>
+        <button mat-menu-item>
+            <mat-icon>assignment</mat-icon>
+            <span>Button Name</span>
+        </button>
+    </div>
+</adf-sidebar-action-menu>
+```
+
+## Class members
+
+### Properties
+
+| Name | Type | Default value | Description |
+| ---- | ---- | ------------- | ----------- |
+| expanded | `boolean` |  | Toggle the sidebar action menu on expand. |
+| title | `string` |  | The title of the sidebar action. |
+| width | `number` | 272 | Width in pixels for sidebar action menu options. |
+
+## Details
+
+As the name suggests, this is basically just a layout with CSS styling.