short-to-mid term plan for improving docs, structure, and formatting

[jGaboardi]

Following #279, we should focus back on:

• exposing & documenting current functionality
  • Tutorial notebooks need more narrative #101
    • skater 9a74373
  • Expose, document, and demonstrate AZP variants #170
  • Allow passing all keywords into Spenc #172 (eec3ab2)
  • fill and and standardize docstrings #173
  • update docs for new location models #269
• rerun all notebooks and the binder to ensure functional
  • P-Median Problem Tutorial Binder example #276
  • AttributeError: type object 'FacilityModelBuilder' has no attribute 'add_maximized_min_variable' #278
• automate formatting standards, etc.
  • Add issue template #210
  • add linting to CI and pre-commit
    • black, isort, flake8
    • see momepy as an example