[UI Kit Documentation] - NPM 6 and the breakage on NPM7

[isacoder]

Description

I have discovered that github actions for deploy runs on npm 6 because is built with node12, at some point I updated my local machine to npm 7 and I broke package-lock.json

npm 7 is available only from node 16

https://stackoverflow.com/questions/64813775/is-there-any-way-to-fix-package-lock-json-lockfileversion-so-npm-uses-a-specific

nodejs/node#37689

For now we should update this in de documentation but found solutions for npm 7 and 8 later on.