Remove duplicated text (#467)

**Syntax Highlighting** is already covered [here](https://vue-loader.vuejs.org/en/start/spec.html) (and is updated).

Author: whoan

docs/en/start/setup.md

@@ -1,9 +1,5 @@
 # Setting Up a Project
 
-### Syntax Highlighting
-
-First thing first, you will probably want proper syntax highlighting for `*.vue` components. Currently there are syntax highlighting support for [Sublime Text](https://github.com/vuejs/vue-syntax-highlight), [Atom](https://atom.io/packages/language-vue), [Visual Studio Code](https://marketplace.visualstudio.com/items?itemName=seanwash.vue) and [Vim](https://github.com/posva/vim-vue). Contributions for other editors/IDEs are highly appreciated! If you are not using any pre-processors in Vue components, you can also get by by treating `*.vue` files as HTML in your editor.
-
 ### Using `vue-cli`
 
 It's recommended to scaffold a project using `vue-loader` with `vue-cli`: