Update environment variable paths in README

[sylwia-budzynska]

It looks like the paths in the example were switched around. @anticomputer is this correct?

[Copilot]

Pull Request Overview

Updates environment variable paths in README documentation to correct inconsistent path mappings between the example configuration and deployment command.

• Standardizes CODEQL_DBS_BASE_PATH to use "/codeql_databases" in the environment configuration example
• Updates the deployment example to use consistent path mappings between MY_DATA and CODEQL_DBS_BASE_PATH

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[m-y-mo]

It does look like it, but then in the second example, /codeql_databases is not mounted, so maybe it makes more sense to change both the CODEQL_DBS_BASE_PATH to /app/my_data/codeql_databases instead so at least it'd be mounted in the docker container in the examples?