Update retrospective and build instruction

Refactor ImageSize value prop, Update state with useEffect

Rename function

Formatting changes

Convert to arrow function

Refactor to func. comp. Convert state. Rename GFprops

Refactor to func. comp.

Refactor to function comp, convert defaultValue to value

Refactor conditional statement

Refactor to arrow function

Refactor to function component

Refactor to function component, remove conditional style

Update node packages

Remove unused import

Update LICENSE