Update conf promo copy

Author: hexagoncircle

src/site/index.njk

@@ -15,7 +15,7 @@ layout: layouts/base.njk
     </a>
     <h2 class="mt-8">Join us at Jamstack Conf!</h2x>
     <p class="mt-4 text-lg md:text-xl mb-5 w-2/3 md:w-1/2 mx-auto">
-      Join thousands of web developers for two days dedicated to building modern web projects.
+      Join thousands of web developers for two days dedicated to building the modern web.
     </p>
     <p class="mb-5">
       <a href="/conf/" class="cta">Attend Jamstack Conf</a>