docs: adding privacy-friendly analytics

Author: wovalle

docgen/index.html

@@ -86,5 +86,6 @@
     <script src="//unpkg.com/docsify/lib/plugins/ga.min.js"></script>
     <script src="//unpkg.com/docsify-copy-code@2"></script>
     <script src="//unpkg.com/docsify-pagination/dist/docsify-pagination.min.js"></script>
+    <script async defer data-website-id="dfa49c27-c8c3-48b8-9799-8954c24c4aba" src="https://analytics.willy.im/umami.js"></script>
   </body>
 </html>