Remove superfluous info on config system

docs/source/config/index.rst

@@ -9,7 +9,6 b' Configuration and customization'
 
    intro
    extensions/index
-   ipython
    integrating
    editors
    inputtransforms

docs/source/config/intro.rst

@@ -44,6 +44,46 b' and sets)::'
 .. versionadded:: 2.0
    list, dict and set methods for config values
 
+Example config file
+```````````````````
+
+::
+
+    # sample ipython_config.py
+    c = get_config()
+
+    c.TerminalIPythonApp.display_banner = True
+    c.InteractiveShellApp.log_level = 20
+    c.InteractiveShellApp.extensions = [
+        'myextension'
+    ]
+    c.InteractiveShellApp.exec_lines = [
+        'import numpy',
+        'import scipy'
+    ]
+    c.InteractiveShellApp.exec_files = [
+        'mycode.py',
+        'fancy.ipy'
+    ]
+    c.InteractiveShell.autoindent = True
+    c.InteractiveShell.colors = 'LightBG'
+    c.InteractiveShell.confirm_exit = False
+    c.InteractiveShell.deep_reload = True
+    c.InteractiveShell.editor = 'nano'
+    c.InteractiveShell.xmode = 'Context'
+
+    c.PromptManager.in_template  = 'In [\#]: '
+    c.PromptManager.in2_template = '   .\D.: '
+    c.PromptManager.out_template = 'Out[\#]: '
+    c.PromptManager.justify = True
+
+    c.PrefilterManager.multi_line_specials = True
+
+    c.AliasManager.user_aliases = [
+     ('la', 'ls -al')
+    ]
+
+
 Command line arguments
 ----------------------