title: tailwindcss is not purged even with template paths provided
body: <p>i run <code>npm run build</code> of course in production mode but my tailwind styles are not purged</p>
  <p>i use webpack + postcss and i filled the purge array in tailwind.config.js with my templates paths and even that i see :</p>
  <pre><code>warn - Tailwind is not purging unused styles because no template paths have been provided
  warn - If you have manually configured PurgeCSS outside of Tailwind or are deliberately not removing unused styles, set `purge: false` in your Tailwind config file to silence this warning.
  </code></pre>
  <p>my tailwind.config.js:</p>
  <pre><code> module.exports = {
      purge: [&quot;public/index.html&quot;],
      darkMode: false, // or 'media' or 'class'
      theme: {
          extend: {},
      },
      variants: {
          extend: {},
      },
      plugins: [],
  };
  </code></pre>
  <p>and my postcss.config.js</p>
  <pre><code>module.exports = {
      plugins: {
          tailwindcss: require(&quot;tailwindcss&quot;),
          autoprefixer: require(&quot;autoprefixer&quot;),
      },
  };
  </code></pre>