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

docs/features/header.md

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+---
+---
+
+# Header
+
+The application [header](https://github.com/Alfresco/alfresco-content-app/tree/master/src/app/components/header) has three main elements.
+
+1. [Logo and Color](#logo-and-color)
+2. [Search](#search)
+3. [Current User](#current-user)
+
+![Header](../images/header.png)
+
+## Logo and Color
+
+Logo & app primary color - logo and color are configurable by updating the
+[app.config.json](https://github.com/Alfresco/alfresco-content-app/blob/master/src/app.config.json) file in the root folder of the project.
+Please refer to the [Application Configuration](/getting-started/configuration) documentation for more information on how to change the logo and color.
+
+## Search
+
+The application [Search](https://github.com/Alfresco/alfresco-content-app/tree/master/src/app/components/search) -
+uses the [ADF Search Component](https://github.com/Alfresco/alfresco-ng2-components/tree/master/lib/content-services/search).
+The app provides a 'live' search feature, where users can open files and folders directly from the Search API results.
+
+![Search Input](../images/search.png)
+
+If you type `Enter` in the text input area, you are going to see
+[Search Results](/features/search-results) page
+with advanced filtering and faceted search.
+
+## Current User
+
+[Current User](https://github.com/Alfresco/alfresco-content-app/tree/development/src/app/components/current-user) -
+displays the user's name, and a menu where users can logout.
+Optionally through updating the [app.config.json](https://github.com/Alfresco/alfresco-content-app/blob/master/src/app.config.json)
+a language switching menu can be displayed.
+
+![Current User](../images/current-user.png)