Add style guide link in tip

Author: ktquez

src/project/how-to-contribute.md

@@ -13,7 +13,7 @@ If you are willing to develop, there is no mystery, just open a Pull Request fol
 This website uses Vuepress, TailwindCSS, and Composition API. 
 
 ::: alert tip
-Try to follow the official style guide for Vue.js as much as possible.
+Try to follow the [official style guide for Vue.js](https://vuejs.org/v2/style-guide/) as much as possible.
 :::
 
 ## Writing

src/pt/projeto/como-contribuir.md

@@ -13,7 +13,7 @@ Se você estiver disposto a desenvolver, não tem nenhum mistério, basta abrir
 O site usa [Vuepress](https://vuepress.vuejs.org/), [TailwindCSS](https://tailwindcss.com/), e [Composition API](https://composition-api.vuejs.org/). 
 
 ::: alert tip
-Tente seguir ao máximo o guia de estilos oficial para Vue.
+Tente seguir ao máximo o [guia de estilos oficial para Vue](https://vuejs.org/v2/style-guide/).
 :::
 
 ## Escrevendo