Make the monitor visitation likelihood a story-based form

[youralien]

Inspired by such calculators which put the parameters of a story inline with the text
https://investor.vanguard.com/tools-calculators/retirement-income-calculator

The key ways to achieve this are

• Whole bunch of <span> elements for the parts of the paragraph
• Style the input UIs so they have underlines under them, and no other borders
• Use a flexbox so that all of it can wrap for different window resizes