Remove gulp and commented out code.

build.php

@@ -8,7 +8,6 @@
 /* Parameters: 
  --no-composer      Does not install vendors. Just create the autoloader.
  --cleanup          Remove removeables. 
- --allow-gulp       Allow gulp to be used. 
  --install-npm      Install NPM package instead
 */
 
@@ -46,16 +45,6 @@
     }
 }
 
-//Run build if package-lock.json is found
-if(file_exists('package-lock.json') && !file_exists('gulp.js')) {
-    $buildCommands[] = 'npx --yes browserslist@latest --update-db';
-    //$buildCommands[] = 'npm run build';
-
-    //$buildCommands[] = 'npm run build';
-} elseif(file_exists('package-lock.json') && file_exists('gulp.js') && is_array($argv) && in_array('--allow-gulp', $argv)) {
-    $buildCommands[] = 'gulp';
-}
-
 // Files and directories not suitable for prod to be removed.
 $removables = [
     '.git',
@@ -72,7 +61,6 @@
     'package.json',
     'phpunit.xml.dist',
     'README.md',
-    'gulpfile.js',
     './node_modules/',
     './source/sass/',
     './source/js/',