Removed unused custom monaco webpack plugin

config/plugins/monaco_webpack.js

-const { languagesArr } = require('monaco-editor-webpack-plugin/out/languages');
-
-// monaco-yaml library doesn't play so well with monaco-editor-webpack-plugin
-// so the only way to include its workers is by patching the list of languages
-// in monaco-editor-webpack-plugin and adding support for yaml workers. This is
-// a known issue in the library and this workaround was suggested here:
-// https://github.com/pengx17/monaco-yaml/issues/20
-
-const yamlLang = languagesArr.find((t) => t.label === 'yaml');
-
-yamlLang.entry = [yamlLang.entry, '../../monaco-yaml/lib/esm/monaco.contribution'];
-yamlLang.worker = {
-  id: 'vs/language/yaml/yamlWorker',
-  entry: '../../monaco-yaml/lib/esm/yaml.worker.js',
-};
-
-module.exports = require('monaco-editor-webpack-plugin');