fix: don't style comments and keywords by default

Author: tmillr

lua/github-theme/config.lua

@@ -13,9 +13,9 @@ local defaults = {
   dim_inactive = false,
   module_default = true,
   styles = {
-    comments = 'italic',
+    comments = 'NONE',
     functions = 'NONE',
-    keywords = 'italic',
+    keywords = 'NONE',
     variables = 'NONE',
     conditionals = 'NONE',
     constants = 'NONE',