fix(PackageLock): reinstall GitHub docgen dev dependency

[MattIPv4]

Please describe the changes this PR makes and why it should be merged:

GitHub Actions & local installs using npm ci fail currently due to a GitHub ssh dependency in the lock file. Reinstalling the docgen dependency using the http GitHub URl should resolve this.

Status

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

Semantic versioning classification:

• This PR changes the library's interface (methods or parameters added)
  • This PR includes breaking changes (methods removed or renamed, parameters moved or removed)
• This PR only includes non-code changes, like changes to documentation, README, etc.

[MattIPv4]

This moves the lockfile back to v1 at the same time -- package.json states Node 12+ is supported, only Node 15+ uses lockfile v2

[iCrawl]

I would still want to use lockfile v2 sometimes soon moving forward, just to keep this on the record. The moment devs move to Node 15/16 they will automatically use npm7.
Node support shouldn't matter to the lockfile itself.