[docs] Align GitBook theming to main Vue.js site (#448)
[docs] Align GitBook theming to main Vue.js site (#448)

* [docs] Align GitBook theming to main Vue.js site

* Revert "[docs] Align GitBook theming to main Vue.js site"

This reverts commit 9aad1473626f1cc9b5bc995cb4028c0412b2c3df.

* [docs] Move all css to a plugin

vuejs/vuex,vuejs/vuex