React 18

[ingalls]

Context

The dependencies here are starting to get long in the tooth.

• Breaking Remove 8.x requirement for node engine in favour of >= 18
• Update Gulp Sass/Node-Sass to fix python Node-Pre-Gyp errors with python 2 vs 3
• Update React t0 version 18 & associated

Blockers

• [ ] https://github.com/danielfdsilva/reactScrollbar/ needs to be updated to React 18

cc/ @wrynearson @danielfdsilva @vgeorge

[ingalls]

Closing in favour of https://github.com/developmentseed/ui-seed