enhance historical changes

[KyleMit]

• [x] build historical file (initial)
  • [x] extract all previous versions of a file from git (with date stamp as name) [manual|script]
• [x] display last update date at question level
• [x] provide diffing for any changes over last [3|4|5]? days
• [x] refactor how we archive questions (ongoing)
  • add changes to revisions history as soon as they appear if there's a delta

Possible archive format:

[
    {
        "id": 4534,
        "revs": [
            {
                "date": "2020-07-13",
                "question": "What are the symptoms of CoronaVirus",
                "answer": "People with COVID-19 have had a wide range of symptoms reported"
            },
            {
                "date": "2020-07-14",
                "question": "What are the symptoms of COVID-19?",
                "answer": "People with COVID-19 have had a wide range of symptoms reported"
            }
        ]
    }
]

[KyleMit]

• Possible enhancement down down the road - timetravel to version at specific date - not scope for current issue
  • Alternatively consider only keeping last n revisions
• Possible enhancement down the road - filter by new/updated - sort by last modified