App requires node.js v6

[p-a-s-c-a-l]

The scenario-analysis is written in AngularJS 1 and does not build with node.js > v6.
To be able to work with more recent node.js versions that are required by modern web frameworks like React, on Windows nvm, a node.js version management utility for Windows, can be used.

Switch between different node versions with:

nvm use 6.11.4
nvm use 12.7.0