Move postcode unit files one folder down

[rm-hull]

No description provided.

[github-actions]

	Tests	Passed ❌️	Skipped	Failed
JUnit Test Report	0 ran	0 passed	0 skipped	0 failed

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[gemini-code-assist]

Summary of Changes

Hello @rm-hull, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request reorganizes the directory structure by moving postcode unit files into a dedicated subdirectory. It also updates the application code to reflect this change and adds an exclusion rule to the .gitignore file to prevent debug binaries from being tracked, thus improving the organization and cleanliness of the repository.

Highlights

• Directory Restructuring: Moves the postcode unit files to a subdirectory named units within the data/postcodes directory.
• File Exclusion: Adds __debug_bin* to the .gitignore file to prevent debug binaries from being tracked.
• Output Path Modification: Updates the output file path in cmd/extract_data.go to reflect the new directory structure.

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[gemini-code-assist]

Code Review

The pull request moves the postcode unit files to a subdirectory named units within the data/postcodes directory. It also adds __debug_bin* to the .gitignore file. The code change in cmd/extract_data.go updates the output file path to reflect this new directory structure.