use config for title and tagline

app/__init__.py

@@ -162,6 +162,7 @@ cache = Cache()
 def create_app():
     app = Flask(__name__)
     app.config['SITE_NAME'] = 'Pyrom'
+    app.config['SITE_TAGLINE'] = 'anti-social media'
     app.config['DISABLE_SIGNUP'] = False
     app.config['MODS_CAN_INVITE'] = True
     app.config['USERS_CAN_INVITE'] = False