Remove lockfile

[LeoDog896]

There are currently two lockfiles in the repository, yarn.lock and package-lock.json. Two (possible) ways that this should be mitigated:

• Choose a preferred package manager (personally in favor of yarn or pnpm)
• Exclude a preferred package manager (as this is a library, there's no need to have a lockfile, especially considering that it encourages CI to test against unpinned files that won't be replicated).

[Mitcheljager]

Closed with f5d265e