updated README.md

code cleanup

frontend/src/components/MarkdownEditor/defaultOptions 2.js

@@ -1,31 +0,0 @@
-// doc: https://nhnent.github.io/tui.editor/api/latest/ToastUIEditor.html#ToastUIEditor
-export default {
-  minHeight: '200px',
-  previewStyle: 'vertical',
-  useCommandShortcut: true,
-  useDefaultHTMLSanitizer: true,
-  usageStatistics: false,
-  hideModeSwitch: false,
-  toolbarItems: [
-    'heading',
-    'bold',
-    'italic',
-    'strike',
-    'divider',
-    'hr',
-    'quote',
-    'divider',
-    'ul',
-    'ol',
-    'task',
-    'indent',
-    'outdent',
-    'divider',
-    'table',
-    'image',
-    'link',
-    'divider',
-    'code',
-    'codeblock'
-  ]
-}