Fix Docker image for usage on Azure AppService

[DUNK025]

Since the official unstructured-api image doesn´t work on Azure AppServices, the pip and app files must be moved from the home/notebook-user folder to another folder on the system (in this case /opt).

It seems that Azure tries to mount or modify the home directory in our container with contents from their kudu OS, which leads to an empty /home/notebook-user folder.

The error message in azure looks as follows:

ERROR - Container start failed for {APP_SERVICE_INSTANCE} with System.AggregateException, One or more errors occurred. 
(Docker API responded with status code=BadRequest, response={"message":"failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: exec: \"scripts/app-start.sh\": stat scripts/app-start.sh: no such file or directory: unknown"})
InnerException: Docker.DotNet.DockerApiException, Docker API responded with status code=BadRequest, response={"message":"failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: exec: \"scripts/app-start.sh\": stat scripts/app-start.sh: no such file or directory: unknown"}