Add roadmap (#254)

Author: ildyria

src/navigation.js

@@ -27,6 +27,10 @@ export const headerData = {
       text: 'About us',
       href: '/support',
     },
+    {
+      text: 'Roadmap',
+      href: '/roadmap',
+    },
     {
       text: 'Lychee <span class="text-sky-500 ml-1">SE</span>',
       href: '/get-supporter-edition',