Added Current Positions and Previous Positions

[paulmwatson]

And fixed Instagram column

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: pombola/south_africa/views/download.py

Function	Unhandled Issue
person_row_generator	TypeError: sequence item 0: expected string, PositionTitle found /organisation/{slug}/peopl... Event Count: 2
person_row_generator	AttributeError: 'RelatedManager' object has no attribute 'former' /organisation/{slug}/peop... Event Count: 1
person_row_generator	AttributeError: 'NoneType' object has no attribute 'name' /organisation/{slug}/people/downl... Event Count: 1

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