Pre-process and ingest historical neighborhood in context data

[mciethan]

Minimally, whatever variables Mia already processed for each decade going back to 1950. This will involve setting up the user selection of variables from the drop-down

This task will also involve figuring out how to abstract the code in such a way that we can (ideally) have a single set of methods for generating the map / line chart / bar chart from an arbitrary number of variables

• [x] Add a tab system for geographies - start with tract and neighborhood
• [x] Decide on a data format that combines (subcity / citywide) * (binned data / central tendency) for a given variable
• [x] Reformat the household income data to conform with the above data format standard
• [x] Reformat and ingest the neighborhood-level data that Mia already pulled
• [x] Test multiple variables with the same geography type using Mia's neighborhood-level data
• [x] Abstract the app code so that adding new variables to the website just requires plugging in fresh parameters

[mciethan]

sub-tasks for parameterizing the app code:

• [x] format text for the line chart y-axis, which should also match the leaflet legend
• [x] make map legend and line chart titles the same
• [x] category buckets for the bar chart
• [x] format text for the hovers on the line and bar charts