Add Vix roadmap page

Author: GaspardKirira

vix-site/index.html

@@ -64,7 +64,7 @@
     <meta name="twitter:site" content="@vix_cpp" />
     <meta name="mobile-web-app-capable" content="yes">
 
-    <!-- Favicons / App icons (single source: /assets/pwa) -->
+    <!-- Favicons / App icons (single source:  /assets/pwa) -->
     <link rel="icon" href="/assets/pwa/favicon.ico" />
     <link rel="icon" type="image/png" sizes="16x16" href="/assets/pwa/favicon-16x16.png" />
     <link rel="icon" type="image/png" sizes="32x32" href="/assets/pwa/favicon-32x32.png" />