delete "ADD config config" (#83)

this is because everywhere about docker build write to create and use configs/config folder, not config, if we follow docker installation guide, there will not exist config folder in artemis root. Even if the folder exists, the folder will not be mapped inside the container, then we will get a build error about config not exist
in docker-compose.yml
```
  app:
    hostname: ma.app
    build: .
    volumes:
      - ./aime:/app/aime
      - ./configs/config:/app/config
```

in INSTALL_DOCKER.md

- Create 'aime', 'configs', 'AimeDB', and 'logs' folder in ARTEMiS root folder (where all source files exist)
- Inside configs folder, create 'config' folder, and copy all .yaml files from example_config to config (thats all files without nginx_example.conf)
- Edit .yaml files inside configs/config to suit your server needs
- Edit core.yaml inside configs/config

I checked this file history
in d1259509ad, phantomlan already delete this, but don't know why it come back between 040742a9a4 and 565dc38e9a, maybe git bug? However, now delete it again

Reviewed-on: #83
Co-authored-by: zaphkito <zaphkito@noreply.gitea.tendokyu.moe>
Co-committed-by: zaphkito <zaphkito@noreply.gitea.tendokyu.moe>

Dockerfile

@@ -15,7 +15,6 @@ COPY dbutils.py dbutils.py
 COPY read.py read.py
 ADD core core
 ADD titles titles
-ADD config config
 ADD logs logs
 ADD cert cert