Webpack-cli: [BUG]: Remove mention of webpack-scaffold in README.md

[evenstensberg]

Describe the bug

Right now, we are moving away from the webpack-scaffold package and AST transformations and creating these this way. The documentation is wrong

What is the current behavior?

Current documentation includes mention of webpack-scaffold package.

To Reproduce

Steps to reproduce the behavior:

1. Open up README.md
2. 
   Expected behavior

No mention of the webpack scaffold package.

Screenshots

N/A

Please paste the results of webpack-cli info here, and mention other relevant information
N/A
Additional context

Remove the mention of webpack-scaffold and the mention of the utility suite and rather mention generators. We use generators to scaffold a new application for you.

[evenstensberg]

This bug is for first time contributors only

[alexander-akait]

/cc @webpack/cli-team Let's fix it