Onboarding page-1 complete for

This page uses my first (albeit simple) illustration - created by accident in Figma when creating the app prototype.

Additionally,
* Moved some of the service classes into app/services
* Since I've handled file uploads now - this should make further form building easier for step-2 and step-3 of onboarding

Tiny list of achievements for today:
* For the first time, I wrote frontend javascript code to upload a file via API (using fetch function). I don't even remember doing this (or atleast understanding what I did) in the last 14yrs of writing code.
* Handled the uploaded file via a Rails controller. Again - don't remember doing this without the help of a library before.