Homework assignment v1.1.x => v1.2.x; Preps to v1.3.x

## Complete the items below

**P0** - must have
**P1** - nice to have; put aside for a while when any task of a higher priority arrives (e.g. next homework in the course)
**P2** - you will really ramp your skills up if you do; put aside when any task of a higher priority arrives (e.g. next homework in the course)

**v1.1.x => v1.2**
- [ ] **P0**: split your code base into modules (components, data/API, framework)
- [ ] **P0**: migrate to JSX
- [ ] **P1**: make your app looking nice with a touch of visual design / css-styling

No files, tests, or entry points are named; start by reviewing the existing codebase and identifying its components, data/API, and framework boundaries. Done means the code is split into those modules, the JSX migration is complete, and the app has the requested visual/CSS styling.

Written by the indexing model from the issue text.