More doc improvments: moved overview into doc system so it can be distributed...

More doc improvments: moved overview into doc system so it can be distributed with the package, and fixed a few spelling errors in templates doc (fixes #31).


git-svn-id: http://code.djangoproject.com/svn/django/trunk@49 bcc190cf-cafb-0310-a4f2-bffc1f526a37