Switch to JPA for database

Dockerfile

@@ -5,7 +5,7 @@ WORKDIR /app
 COPY .mvn/ .mvn
 COPY mvnw pom.xml ./
 COPY src ./src
-COPY bot.config.example bot.config ./
+COPY bot.properties.example bot.properties ./
 
 RUN ./mvnw -q -Dmaven.test.skip=true package