deduplicate TITLE_SUFFIX from new DOMAIN_NAME

I will need the domain name for feed stuff, and I'm already crudely
using the title suffix in the nav as if it was a domain name, so let's just be
explicit in the case I ever change my mind on domain-in-title styling

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

incorporealcms/config.py

@@ -61,7 +61,8 @@ class Config(object):
     }
 
     DEFAULT_PAGE_STYLE = 'light'
-    TITLE_SUFFIX = 'example.com'
+    DOMAIN_NAME = 'example.com'
+    TITLE_SUFFIX = DOMAIN_NAME
     CONTACT_EMAIL = 'admin@example.com'
 
     # specify FAVICON in your instance config.py to override the provided icon

incorporealcms/pages.py

@@ -168,8 +168,8 @@ def instance_resource_path_to_request_path(path):
 def generate_parent_navs(path):
     """Create a series of paths/links to navigate up from the given resource path."""
     if path == 'pages/index.md':
-        # bail and return the title suffix (generally the domain name) as a terminal case
-        return [(app.config['TITLE_SUFFIX'], '/')]
+        # bail and return the domain name as a terminal case
+        return [(app.config['DOMAIN_NAME'], '/')]
     else:
         if path.endswith('index.md'):
             # index case: one dirname for foo/bar/index.md -> foo/bar, one for foo/bar -> foo