Change predictions api to return float instead of boolean

[malteserteresa]

Objective
Make the predictions api return a float instead of a boolean

Description
In order to have a sliding scale in the pop up to incrementally change level of misogyny, we need to change the predictions api to return a float instead of boolean

Skills
python django

Tools

Time Estimation
small but needs to sync with front end

Detailed description/notes
Needs to wait for the front end to be updated before being merged.