Refactor(docs): apply Diataxis

[angela-tran]

Closes #2894

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Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
benefits
routes.py
settings.py
benefits/core
context_processors.py
mixins.py
session.py
benefits/core/admin
transit.py
benefits/core/models
__init__.py
common.py
enrollment.py
transit.py					70-74, 145-146, 150, 348, 360-363
benefits/enrollment
analytics.py					61
enrollment.py
views.py					79
benefits/in_person
views.py
Project Total

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