Break up deployment docs into separate documents.

docs/deploying/cgi.rst

@@ -0,0 +1,42 @@
+CGI
+===
+
+If all other deployment methods do not work, CGI will work for sure.  CGI
+is supported by all major servers but usually has a less-than-optimal
+performance.
+
+This is also the way you can use a Flask application on Google's
+`AppEngine`_, there however the execution does happen in a CGI-like
+environment.  The application's performance is unaffected because of that.
+
+.. _AppEngine: http://code.google.com/appengine/
+
+Creating a `.cgi` file
+----------------------
+
+First you need to create the CGI application file.  Let's call it
+`yourapplication.cgi`::
+
+    #!/usr/bin/python
+    from wsgiref.handlers import CGIHandler
+    from yourapplication import app
+
+    CGIHandler().run(app)
+
+If you're running Python 2.4 you will need the :mod:`wsgiref` package.  Python
+2.5 and higher ship this as part of the standard library.
+
+Server Setup
+------------
+
+Usually there are two ways to configure the server.  Either just copy the
+`.cgi` into a `cgi-bin` (and use `mod_rerwite` or something similar to
+rewrite the URL) or let the server point to the file directly.
+
+In Apache for example you can put a like like this into the config:
+
+.. sourcecode:: apache
+
+    ScriptAlias /app /path/to/the/application.cgi
+
+For more information consult the documentation of your webserver.