Move symbol mapping to file to pull req

[Trefex]

Summary by Sourcery

This pull request introduces a new configuration file 'mapping.yaml' for symbol mappings, enhances the SyncIBKR class to load these mappings dynamically, and adds support for specifying the IBKR platform ID via an environment variable. Documentation has been updated to reflect these changes.

• New Features:
  • Introduced a new configuration file 'mapping.yaml' to handle symbol mappings.
• Enhancements:
  • Modified the SyncIBKR class to load symbol mappings from 'mapping.yaml' instead of hardcoding them.
  • Added support for specifying the IBKR platform ID via an environment variable 'GHOST_IBKR_PLATFORM'.
• Documentation:
  • Updated README.md to include instructions for using 'mapping.yaml' for symbol mappings.
  • Added documentation for running the container with Podman and specifying the IBKR platform ID.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request introduces a new configuration file (mapping.yaml) for symbol mappings, allowing for dynamic symbol transformation without modifying the code. The SyncIBKR class has been updated to load these mappings, and the documentation has been updated to reflect these changes. Additionally, the main script has been modified to pass the new configuration parameters.

File-Level Changes

Files	Changes
SyncIBKR.py README.md main.py mapping.yaml	Introduced a new configuration file (mapping.yaml) for symbol mappings, updated SyncIBKR class to load and use these mappings, and updated documentation and main script to support the new configuration.

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