remove unnecessary code.

server.js

@@ -378,7 +378,7 @@ async function zipProject() {
   archive.pipe(output);
 
   // append files from a subdirectory, putting its contents at the root of archive
-  archive.directory(path.join(projectPath, 'src', '/'), false);
+  archive.directory(path.join(projectPath, 'src'), false);
 
   // finalize the archive (ie we are done appending files but streams have to finish yet)
   // 'close', 'end' or 'finish' may be fired right after calling this method so register to them beforehand