Remove commented-out alternate image references in configs

Cleaned up unused image lines referencing MDHub in multiple docker-compose files.

docker-compose-prod.yml

@@ -48,7 +48,6 @@ services:
 
   app-redis:
     image: redis:3.0-alpine # docker hub
-    # image: docker.mdhub.kor-elf.net/kor-elf/redis:3.0-alpine # MDHub
     #  restart: always
     volumes:
       - ./redis/data:/data
@@ -103,13 +102,11 @@ services:
     env_file: captcha-app/.env
   captcha-redis:
     image: redis:3.0-alpine # docker hub
-    # image: docker.mdhub.kor-elf.net/kor-elf/redis:3.0-alpine # MDHub
     #  restart: always
     volumes:
       - ./captcha-app/redis/data:/data
   db:
     image: docker.io/mysql:8.0.33 # docker hub
-    # image: docker.mdhub.kor-elf.net/kor-elf/mysql:8.0.33 # MDHub
     command: --default-authentication-plugin=mysql_native_password
     #restart: always
     ports: