Improve package organization

[swissspidy]

Feature Description

It's becoming tricky to organize all dependencies for different React apps in one package.json, and also having inter-dependencies between the various packages.

Possible solution A: npm workspaces.

Background / explanation: https://github.com/npm/rfcs/blob/latest/accepted/0026-workspaces.md

Note: yarn already supports workspaces, but there's no point in switching to that when npm 7 will include them.

Possible solution B: Lerna

Mostly useful if we intend to manage multiple packages in a monorepo and publish them all on npm. (see #1221 for a PoC)

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Acceptance Criteria

QA Instructions

[swissspidy]

Duplicate of #4737