Learning React from scratch

Building React from scratch following a [blog post](https://pomb.us/build-your-own-react/) by pomb.
Used babel to compile/transpile JSX to React.
Tried to build React from scratch using `umd` files, but they aren't supported for latest React version 19.0.*.

Useful Links:
https://pomb.us/build-your-own-react/
   • I tried React and it Ruined My Life