Start prototyping with drag and drop library

[jnguyen9763]

Description

Getting drag and drop working. Make demo-able prototype.

• Try to think about how adding, removing widgets, snap to grid without collisions, responsiveness will work with drag and drop
• Try to do it in TypeScript (https://create-react-app.dev/docs/adding-typescript/)

[jnguyen9763]

Responsive breakpoints

// Small devices (landscape phones, 576px and up)
@media (min-width: 576px) { ... }

// Medium devices (tablets, 768px and up)
@media (min-width: 768px) { ... }

// Large devices (desktops, 992px and up)
@media (min-width: 992px) { ... }

// Extra large devices (large desktops, 1200px and up)
@media (min-width: 1200px) { ... }