[ACA-1889] Separated Features section from Home page (#788)

docs/features/side-navigation.md

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+---
+---
+
+# Side Navigation
+
+The application [side navigation](https://github.com/Alfresco/alfresco-content-app/tree/master/src/app/components/sidenav) has two features:
+a button menu and navigation links.
+
+![Side Navigation](../images/side-nav.png)
+
+## New button
+
+The New button displays a menu which provides three actions:
+
+- Create a new folder - provides a dialog which allows the creation of a new folder, the folder name is mandatory and the description is optional.
+- Upload a file - invokes the operating system file browser and allows a user to select file(s) to upload into their current location in the content repository.
+- Upload a folder - invokes the operating system folder browser and allows a user to select a folder to upload to their current location in the content repository.
+
+When an upload starts the [upload component](https://github.com/Alfresco/alfresco-ng2-components/tree/master/lib/content-services/upload)
+is displayed which shows the user the progress of the uploads they have started.
+The upload dialog persists on the screen and can be minimized; users are able to continue using the application whilst uploads are in progress
+and uploads can be canceled which will stop uploads in progress or permanently delete already completed uploads.
+
+![Uploader](../images/uploader.png)
+
+## Navigation
+
+The navigation links are configurable via the [app.config.json](https://github.com/Alfresco/alfresco-content-app/blob/master/src/app.config.json).
+Default configuration creates two sections.
+See [Navigation](/getting-started/navigation) for more information about configuring the side navigation.