docs: update theme

Author: ktquez

package-lock.json

@@ -82,7 +82,7 @@
     "vue": "^2.6.11",
     "vue-template-compiler": "^2.6.11",
     "vuepress": "^1.3.1",
-    "vuepress-theme-default-vue-a11y": "^0.1.7"
+    "vuepress-theme-default-vue-a11y": "^0.1.8"
   },
   "dependencies": {
     "@vue-a11y/announcer": "^2.0.2",