Issue #3086931 by longwave, zrpnr, Spokje: Remove unused postcss.config.js

module.exports = ctx => ({

  map: !ctx.env || ctx.env !== 'production' ? { inline: false } : false,

  plugins: [

    require('postcss-custom-properties')({

      preserve: false,

      // Breaks style lint and unnecessary if preserve set to false.

      // exportTo: 'dist-css/variables.css',

      importFrom: [

        './themes/claro/css/src/base/variables.css'

      ]

    }),

    require("postcss-calc"),

    require('autoprefixer')({

      cascade: false

    }),

    require('postcss-header')({

      header: `DO NOT EDIT THIS FILE.\nSee the following change record for more information,\nhttps://www.drupal.org/node/3084859\n@preserve`,

    }),

  ]

});

    else

      # If there is no .es6.js file then there should be unless the .js is

      # not really Drupal's.

      if ! [[ "$FILE" =~ ^core/assets/vendor ]] && ! [[ "$FILE" =~ ^core/modules/ckeditor5/js/build ]] && ! [[ "$FILE" =~ ^core/scripts/js ]] && ! [[ "$FILE" =~ ^core/scripts/css ]] && ! [[ "$FILE" =~ core/postcss.config.js ]] && ! [[ "$FILE" =~ webpack.config.js$ ]] && ! [[ -f "$TOP_LEVEL/$BASENAME.es6.js" ]] && ! [[ "$FILE" =~ core/modules/ckeditor5/tests/modules/ckeditor5_test/js/build/layercake.js ]]; then

      if ! [[ "$FILE" =~ ^core/assets/vendor ]] && ! [[ "$FILE" =~ ^core/modules/ckeditor5/js/build ]] && ! [[ "$FILE" =~ ^core/scripts/js ]] && ! [[ "$FILE" =~ ^core/scripts/css ]] && ! [[ "$FILE" =~ webpack.config.js$ ]] && ! [[ -f "$TOP_LEVEL/$BASENAME.es6.js" ]] && ! [[ "$FILE" =~ core/modules/ckeditor5/tests/modules/ckeditor5_test/js/build/layercake.js ]]; then

        printf "${red}FAILURE${reset} $FILE does not have a corresponding $BASENAME.es6.js\n"

        STATUS=1

      fi