Update docker image and README for OpenAI API

- Update docker-compose.yml to use image from ghcr.io repository and add environment variable for OpenAI API Token
- Update README.md instructions to use the ghcr.io repository and remove 3 empty lines at the end of the file

[docker-compose.yml]
- Change the image from `gpt3discord:latest` to `docker pull ghcr.io/Kav-K/GPT3Discord:main`
- Add environment variable for OpenAI API Token
[README.md]
- Change the docker run command to use the ghcr.io repository
- Remove 3 empty lines at the end of the file

README.md

@@ -440,14 +440,11 @@ This can also be run via screen/tmux or detached like a daemon. -->
 ### Docker and Docker Compose :
 To use docker you can use the following command
 ```
-docker run -d --name gpt3discord -v /containers/gpt3discord:/data -v /containers/gpt3discord/share:/data/share --env-file /path/to/.env gpt3discord:latest
+docker run -d --name gpt3discord -v /containers/gpt3discord:/data -v /containers/gpt3discord/share:/data/share --env-file /path/to/.env ghcr.io/Kav-K/GPT3Discord:main
 ```
 Make sure that the /data and /data/share are created and the `env-file` path is correct.
 
 
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 #### Docker Compose 
 To use Docker Compose, you need to have Docker and Docker Compose installed on your system. You can download and install them from the following links:
 

docker-compose.yml

@@ -1,7 +1,7 @@
 version: '3.8'
 services:
   gpt3discord:
-    image: gpt3discord:latest
+    image: docker pull ghcr.io/Kav-K/GPT3Discord:main
     container_name: gpt3discord
     environment:
       OPENAI_TOKEN: "<openai_api_token>"