Chicago: scrape"Action description" text for bill actions

[derekeder]

Chicago's eLMS has an "Action description" for each legislative action. This is often times boilerplate, but sometimes contains additional details, like who initiated a legislative rule outside of the normal course.

Here's an example: https://chicityclerkelms.chicago.gov/Matter/?matterId=D48A32E8-21E6-EE11-904C-001DD809BE52

This information can be stored in the extras field in BillAction as we already have a description field used for the action itself.