Update link to npm registry

Author: Ismail NGUYEN

Diff for: docs/index.html

@@ -18,7 +18,7 @@
                 <div class="row">
                     <div class="col-12 d-flex flex-row align-items-center justify-content-between">
                         <div class="heading-brand">vue-dark-mode-switch</div>
-                        <a href="https://www.npmjs.com/package/throttler-js" class="btn btn-dark" target="_blank">
+                        <a href="https://www.npmjs.com/package/vue-dark-mode-switch" class="btn btn-dark" target="_blank">
                             <i class="fab fa-npm"></i>
                             Download
                         </a>