CR response, move max file size to settings

[#OSF-6670]

Author: TomBaxter

mfr/extensions/codepygments/settings.py

@@ -0,0 +1,9 @@
+try:
+    from mfr import settings
+except ImportError:
+    settings = {}
+
+config = settings.get('CODEPYGMENTS_EXTENSION_CONFIG', {})
+
+
+MAX_SIZE = config.get('MAX_SIZE', 65536)