Make site:doctor generic to be used with Hugo

generators/gulp/templates/gulpfile.js

@@ -38,7 +38,7 @@ gulp.task('deploy', gulp.series('upload'));
 gulp.task('rebuild', gulp.series('clean', 'clean:images'));
 
 // 'gulp check' -- checks your site configuration for errors and lint your JS
-gulp.task('check', gulp.series('site:doctor'));
+gulp.task('check', gulp.series('site:check'));
 
 // 'gulp' -- cleans your assets and gzipped files, creates your assets and
 // injects them into the templates, then builds your site, copied the assets