Remove versionwarning_enabled since it is useless

Author: humitos

README.rst

@@ -56,9 +56,6 @@ Then in your ``conf.py`` you have to add ``versionwarning`` in the ``extensions`
       'versionwarning',
   ]
 
-Enable it and setup the Read the Docs project's slug::
-
-  versionwarning_enabled = True
 
 Remember to configure the ``version`` of your Sphinx project since it's the key for this to work properly::
 
@@ -75,9 +72,6 @@ Customization
 
 Some customization can be done using the ``conf.py`` file of your Sphinx project:
 
-versionwarning_enabled (bool)
-   enable/disable version warning extension
-
 versionwarning_default_admonition_type (string)
    type of admonition for the banner (warning, admonition or note)
 

versionwarning/__init__.py

@@ -23,7 +23,6 @@ def setup(app):
         message=default_message.format(newest='<a href="#"></a>'),
     )
 
-    app.add_config_value('versionwarning_enabled', False, 'html')
     app.add_config_value('versionwarning_message_placeholder', '{newest}', 'html')
     app.add_config_value('versionwarning_default_admonition_type', 'warning', 'html')
     app.add_config_value('versionwarning_default_message', default_message, 'html')