[ADF-4152] Restructured Content Services docs (#4429)

* [ADF-4152] Moved content services docs to subfolders

* [ADF-4152] Manual URL fixes for cont services docs

* [ADF-4152] Moved content services docs to subfolders

* [ADF-4152] Manual URL fixes for cont services docs

* [ADF-4152] Updated doc index pages for content services

docs/content-services/dialogs/library.dialog.md

@@ -0,0 +1,42 @@
+---
+Title: Library dialog component
+Added: v3.0.0
+Status: Active
+Last reviewed: 2018-12-07
+---
+
+# [Library dialog component](../../../lib/content-services/dialogs/library/library.dialog.ts "Defined in library.dialog.ts")
+
+Creates a new Content Services document library/site.
+
+![Dropdown sites](../../docassets/images/CreateLibraryDialog.png)
+
+## Basic Usage
+
+```html
+<adf-library-dialog
+    (success)="useLibraryDetails($event)"
+    (error)="handleError()"
+>
+</adf-library-dialog>
+```
+
+## Class members
+
+### Events
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| error | [`EventEmitter`](https://angular.io/api/core/EventEmitter)`<any>` | Emitted when an error occurs. |
+| success | [`EventEmitter`](https://angular.io/api/core/EventEmitter)`<any>` | Emitted when the new library is created successfully. The event parameter is a [SiteEntry](https://github.com/Alfresco/alfresco-js-api/blob/master/src/alfresco-core-rest-api/docs/SiteEntry.md) object with the details of the newly-created library. |
+
+## Details
+
+This component lets the user create a new document library/site with the usual
+name, ID, description and access restrictions. See the
+[Sites](https://docs.alfresco.com/6.0/concepts/sites-intro.html)
+section of the Content Services documentation for more information.
+
+## See also
+
+-   [Sites dropdown component](../components/sites-dropdown.component.md)