This will prep your urls to work from a subfolder when deployed to GH pages, but still work locally. You'll also need to run `npm install --save grunt-cdn`.

asdf.js

        // add this to your configuration
        cdn: {
            options: {
                cdn: '//YOUR-USERNAME.com/YOUR-REPO-NAME/',
                flatten: true
            },
            dist: {
                src: ['./dist/*.html', './dist/styles/{,*/}*{,*/}*.css']
            }
        }
        // end cdn config
        
        // in your build task config
        grunt.registerTask('build', [
          ...
          // Add this as the last step in your build task
          'cdn:dist'
        ]);

        // don't forget to register the task
        grunt.loadNpmTasks('grunt-cdn');