remove comment (#5650)

* remove comment

* remove useless third party lib

* remove comment

frontend/src/css/react-mentions-default-style.js

@@ -1,81 +0,0 @@
-const defaultStyle = {
-  control: {
-    backgroundColor: '#fff',
-    fontSize: 14,
-    fontWeight: 'normal',
-  },
-  highlighter: {
-    overflow: 'hidden',
-  },
-  input: {
-    margin: 0,
-  },
-  '&singleLine': {
-    control: {
-      display: 'inline-block',
-      width: 130,
-    },
-    highlighter: {
-      padding: 1,
-      border: '2px inset transparent',
-    },
-    input: {
-      padding: 1,
-      border: '2px inset',
-    },
-  },
-  '&multiLine': {
-    control: {
-    },
-    highlighter: {
-      padding: 9,
-    },
-    input: {
-      padding: '8px 6px',
-      minHeight: 90,
-      height: 90,
-      border: '1px solid #e6e6dd',
-      borderBottom: 'none',
-      borderRadius: '5px 5px 0 0',
-      overfflowY: 'auto',
-      outline: 'none',
-      '&focused': {
-        /*
-        backgroundColor: '#cee4e5',
-        outlineOffset: '-2px',
-        outlineColor: '-webkit-focus-ring-color',
-        outlineStyle: 'auto',
-        outlineWidth: '5px',
-        */
-      },
-    },
-  },
-  suggestions: {
-    list: {
-      backgroundColor: 'white',
-      border: '1px solid rgba(0,0,0,0.15)',
-      fontSize: 14,
-      maxHeight: 200,
-      overflow: 'auto',
-      position: 'absolute',
-      bottom: 14,
-      width: '150px',
-    },
-    item: {
-      width: 'auto',
-      padding: '5px 15px',
-      overflowX: 'auto',
-      borderBottom: '1px solid rgba(0,0,0,0.15)',
-      '&focused': {
-        backgroundColor: '#f19654',
-        color: '#fff',
-        fontWeight: '400',
-      },
-    },
-  },
-};
-
-const defaultMentionStyle = {
-};
-
-export { defaultStyle, defaultMentionStyle };