Changes:
- Remove checkmake PowerShell installer (no Windows binaries available)
- checkmake only provides Linux/macOS/FreeBSD binaries, not Windows
- Updated manual instructions to mention Go toolchain requirement
- Down to 5 working PowerShell installers:
  - clj-kondo ✅
  - ktlint ✅
  - checkstyle ✅
  - phpstan ✅
  - taplo ✅

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>