chore(config): colorSchme를 congo로 변경

Author: devmeeple

config/_default/params.toml

@@ -5,7 +5,7 @@
 # Refer to the theme docs for more details about each of these parameters.
 # https://blowfish.page/docs/configuration/#theme-parameters
 
-colorScheme = "github"
+colorScheme = "congo"
 defaultAppearance = "light" # valid options: light or dark
 autoSwitchAppearance = true