BREAKING CHANGE: Large update to dependencies (Webpack 5 + more)

[maxrolon]

These PR represents a major version bump to v2.0.0. The changes in packages/webpacker/package.json represent the majority of changes. Many dependencies need to be upgraded together since they rely in interdependent peerDependency versions.

The breaking changes to the configuration of projects using this package is currently smaller than I anticipated. The key change is that stylelint and postcss will both need to be installed within the project rather than direct dependencies of this Kit.

Next steps:

• Remove Node Sass from this package, allowing this to be set on a per-project basis
• Test on two real-world projects

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