Break up deployment docs into separate documents.

docs/deploying/index.rst

@@ -0,0 +1,19 @@
+Deployment Options
+==================
+
+Depending on what you have available there are multiple ways to run Flask
+applications.  A very common method is to use the builtin server during
+development and maybe behind a proxy for simple applications, but there
+are more options available.
+
+If you have a different WSGI server look up the server documentation about
+how to use a WSGI app with it.  Just remember that your application object
+is the actual WSGI application.
+
+.. toctree::
+   :maxdepth: 2
+
+   mod_wsgi
+   cgi
+   fastcgi
+   others