Add EditorInput component on Instance tab

src/views/settings/components/Instance.vue

 <template>
   <div v-if="!loading" :class="isSidebarOpen" class="form-container">
+    <editor-input />
     <el-form :model="instanceData" :label-position="labelPosition" :label-width="labelWidth">
       <setting :setting-group="instance" :data="instanceData"/>
     </el-form>
@@ -53,11 +54,13 @@
 import { mapGetters } from 'vuex'
 import i18n from '@/lang'
 import Setting from './Setting'
+import { EditorInput } from './inputComponents'
 import _ from 'lodash'
 
 export default {
   name: 'Instance',
   components: {
+    EditorInput,
     Setting
   },
   computed: {

src/views/settings/components/inputComponents/index.js

 export { default as EditableKeywordInput } from './EditableKeywordInput'
+export { default as EditorInput } from './EditorInput'
 export { default as IconsInput } from './IconsInput'
 export { default as ImageUploadInput } from './ImageUploadInput'
 export { default as LinkFormatterInput } from './LinkFormatterInput'