persist LLM sentence explainer with supabase

docs/howtostudykorean/unit-1/20-well-poorly.md

@@ -71,7 +71,7 @@ vocabulary:
       audio: https://www.howtostudykorean.com/wp-content/uploads/2015/11/Lesson20v6.mp3
       en: powder
       examples:
-        - ko: 케이크 반죽에 **밀가루**를 넣으세요
+        - ko: 케이크 반죽에 밀**가루**를 넣으세요
           en: Put some **flour** into the cake batter, please
         - ko: 봄에는 꽃**가루** 알레르기를 조심해 야 해요
           en: You need to be careful about **pollen** allergies in the spring