Initial reorg of docs

[rossmechanic]

Description

The docs started with three sections:

• Quick start
• Common issues
• Advanced
  This made sense when the project was first started, but as features and documentation have been added, doc organization has gotten pretty terrible. Just looking at the advanced section of the docs can be pretty confusing, which doesn't make it any easier for new developers to start using and contributing to django-simple-history. This PR is an initial attempt to reorganize the docs, making it easier to figure out where to add new documentation in the future. This is also a good first step to cleaning up and editing a lot of the existing documentation (which I intend to do in future PRs).

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have run the make format command to format my code
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have added my name and/or github handle to AUTHORS.rst
• I have added my change to CHANGES.rst
• All new and existing tests passed.

[codecov-io]

Codecov Report

Merging #510 into master will increase coverage by 0.26%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #510      +/-   ##
=========================================
+ Coverage   97.63%   97.9%   +0.26%     
=========================================
  Files          17      17              
  Lines         802     905     +103     
  Branches      109     148      +39     
=========================================
+ Hits          783     886     +103     
  Misses          8       8              
  Partials       11      11

Impacted Files	Coverage Δ
simple_history/models.py	99.17% <0%> (+0.32%)	⬆️

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[kseever]

👍