Documentation updates

- added "Automatically find and patch file functions and modules" from Wiki page
- added/fixed some links
- added background color to code boxes for better readability
diff --git a/docs/conf.py b/docs/conf.py
index 95bb2a1..8feb0af 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -127,7 +127,7 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'nature'
+html_theme = 'pyfakefs_theme'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
@@ -136,12 +136,12 @@
 # html_theme_options = {}
 
 # Add any paths that contain custom themes here, relative to this directory.
-# html_theme_path = []
+html_theme_path = ['.']
 
 # The name for this set of Sphinx documents.
 # "<project> v<release> documentation" by default.
 #
-# html_title = 'pyfakefs v3.0'
+html_title = 'pyfakefs v3.4'
 
 # A shorter title for the navigation bar.  Default is the same as html_title.
 #
@@ -173,7 +173,7 @@
 # bottom, using the given strftime format.
 # The empty string is equivalent to '%b %d, %Y'.
 #
-# html_last_updated_fmt = None
+html_last_updated_fmt = '%b %d, %Y'
 
 # If true, SmartyPants will be used to convert quotes and dashes to
 # typographically correct entities.