better concurrency debugging, --concurrency flag for npx quartz build

Jacky Zhao

2023-08-09 49bd6bc3ffe1d3507e00bae62c12d9b045363090

 quartz/path.ts

@@ -221,7 +221,7 @@
}

function _getFileExtension(s: string): string | undefined {
  return s.match(/\.[A-Za-z]+$/)?.[0]
  return s.match(/\.[A-Za-z0-9]+$/)?.[0]
}

function _isRelativeSegment(s: string): boolean {