docs: update tailwind v2 using yarn

docs/content/en/setup.md

@@ -87,24 +87,17 @@ See the [module options](/options).
 
 Nuxt 2.14 is still using PostCSS 7, we have a [pull request](https://github.com/nuxt/nuxt.js/pull/8346) opened to upgrade the dependencies. Once merged on `v2.15`, we will release a major version of this module to include TailwindCSS 2, see [PR#203](https://github.com/nuxt-community/tailwindcss-module/pull/203).
 
-In the meantime, you can upgrade Tailwind by using the [compatibily build](https://tailwindcss.com/docs/installation#post-css-7-compatibility-build):
+In the meantime, you can upgrade Tailwind by using the [compatibily build](https://tailwindcss.com/docs/installation#post-css-7-compatibility-build).
 
-<code-group>
-  <code-block label="Yarn" active>
+<alert type="warning">
 
-  ```bash
-  yarn add --dev tailwindcss@npm:@tailwindcss/postcss7-compat postcss@^7 autoprefixer@^9
-  ```
-
-  </code-block>
-  <code-block label="NPM">
+We have seen an issue with NPM regarding the packages resolution (see [comment](https://github.com/nuxt-community/tailwindcss-module/issues/202#issuecomment-738442349)), we hightly recommend to use [Yarn V1](https://classic.yarnpkg.com/en/docs/install) when working with Nuxt 2.
 
-  ```bash
-  npm install --save-dev tailwindcss@npm:@tailwindcss/postcss7-compat postcss@^7 autoprefixer@^9
-  ```
+</alert>
 
-  </code-block>
-</code-group>
+```bash
+yarn add --dev tailwindcss@npm:@tailwindcss/postcss7-compat postcss@^7 autoprefixer@^9
+```
 
 Please ensure you are using `Node >= 12.13.0` in order to use the version 2 of TailwindCSS.