优化安装的错误提示

.vuepress/enhanceApp.js

@@ -7,7 +7,7 @@ import 'vue2-animate/dist/vue2-animate.min.css';
 import AOS from 'aos';
 import 'aos/dist/aos.css';
 
-import BootstrapVue from 'bootstrap-vue'
+import { BootstrapVue, BootstrapVueIcons } from 'bootstrap-vue'
 
 import Container from './grid/Container'
 import Grid from './grid/Grid'
@@ -36,6 +36,7 @@ export default ({
 }) => {
   Vue.use(VueClipboard)
   Vue.use(BootstrapVue)
+  Vue.use(BootstrapVueIcons)
   Vue.use(VueFractionGrid, {
     approach: 'desktop-first',
     gutter: '1rem',