A little dependency cleanup

Purpose

• Force a newer version of chokidar

  See: gitlab-org/gitlab-services/design.gitlab.com!2251 (merged)

• Remove deprecated eslint-loader

  See: gitlab-org/gitlab-services/design.gitlab.com!2321 (merged)

• Replace husky with lefthook

  See: gitlab-org/gitlab-services/design.gitlab.com!2348 (merged)

Screenshots

N/A

Checklist

For a new icon and/or illustration:

• If this adds an icon ensure that it follows the new icon checklists.
• If this adds an illustration ensure that it follows the new illustration checklists.