Issue #27: Remove the 'User permissions' section from README.md, for …

…now.

A new version of this section may be re-added later.

README.md

@@ -119,23 +119,6 @@ You also must set the viewer for this kind of media.
   _Collabora Online Preview_.
 - Click _Save_.
 
-### User permissions
-
-There are three levels of permissions. _Administrator_,
-_Collaborator_, and _Viewer_, in order of most privileges to the
-least. Each lesser privilege is included in the higher level.
-_Administrator_ includes _Collaborator_, and _Collaborator_ includes
-_Viewer_.
-
-By default, the user role `administrator` is mapped to the Collabora
-Online administrator. This allow accessing the console.
-
-The user role `authenticated` is the default permission for
-collaboration, i.e. edit a document with Collabora Online.
-
-The user role `anonymous` by default disallows editing and is the
-minimal permission for viewing documents in Collabora Online.
-
 ### Other configuration
 
 If you need to change the accepted extensions to upload, go to