Minor ARG workbook tidying

[hyanwong]

No description provided.

[Copilot]

Pull request overview

This PR performs minor tidying and improvements to ARG (Ancestral Recombination Graph) workbook notebooks and supporting module. The changes focus on improving text clarity, fixing documentation, and refactoring platform detection logic.

• Refactored platform detection from try/except to explicit sys.platform check
• Improved text clarity and documentation with better explanations and added hyperlinks
• Enhanced CSS styling for code elements in hyperlinks

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
content/WhatIsAnARG_workbook2.ipynb	Refactored platform detection logic, improved text flow and documentation (removed incomplete sentences, reorganized stdpopsim section)
content/WhatIsAnARG_workbook1.ipynb	Added missing punctuation, improved documentation with hyperlinks and clearer explanations for table/array access methods
content/WhatIsAnARG_module.py	Added CSS styling rules to color code elements within hyperlinks appropriately

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