Add dark mode and add upgrade CI

What's Changed

• ci: create upgrade-packages.yml by @MichaelCurrin in #128
• build(deps): Upgrade NPM packages (automated) by @github-actions in #129
• feat: Add dark mode by @minhhang107 in #130

New Contributors

• @github-actions made their first contribution in #129
• @minhhang107 made their first contribution in #130

Full Changelog: v2.17.0...v2.18.0