Update description

docs_overrides/index.html

     <div class="splash-container md-grid">
         <div class="splash-text md-typeset appear text-center">
             <h2><em>Create Augmented Reality experiences for the web.</em></h2>
-            <p>No need to download apps. No need of AR hardware. Free and open-source.</p>
+            <p>Open source WebAR engine. Runs everywhere. Easy to get started.</p>
             <a href="{{ './getting-started' | url }}" class="md-button md-button--primary">Get started</a>
-            <a href="{{ './demo' | url }}" class="md-button">Try a demo</a>
+            <a href="{{ './demo' | url }}" class="md-button" target="_blank">Try a demo</a>
         </div>
         <!--
         <div class="splash-image">

mkdocs.yml

 site_name: "MARTINS.js: GPU-accelerated Augmented Reality for the web"
 site_url: https://alemart.github.io/martins-js
 site_author: Alexandre Martins
-site_description: Free and open-source WebAR engine based on Speedy Vision.
+site_description: Open source WebAR engine. Runs everywhere. Easy to get started.
 copyright: Copyright © 2022 - present Alexandre Martins
 
 repo_name: alemart/martins-js