Bumps a few security vulnerabilities / dependencies

• Docs updates - no longer recommending using the chron PR labeler. Rather, use the Github actions/labeler since it now supports pull_request_target and can run from the main branch when forks are attempting to PR.
• NPM security audit bump

Security bump for v1.

This release primarily fixes some issues with the actions/core library

• Addressed #29 - Enable merge method to be configured on automatic merger
• Addressed #26 - PR job to remove the lgtm label on PR update
• Update and fix up documentation
• Dependency bumps

The initial release for prow-github-actions! 🎉