Remove package-lock.json (#2907)
Remove package-lock.json (#2907)

Yarn can read changes from `package-lock.json`, but prefers for it not
to be around. Our dev server says the following on boot:

> warning package-lock.json found. Your project contains lock files generated by tools other than Yarn. It is advised not to mix package managers in order to avoid resolution inconsistencies caused by unsynchronized lock files. To clear this warning, remove package-lock.json.
common-voice/common-voice,common-voice/common-voice,common-voice/common-voice,common-voice/common-voice