Update CFP button and banner on homepage (#455)

* Update index.html

* Update banner.html

Author: AmandaPerino

_includes/banner.html

@@ -1,7 +1,7 @@
 <div class="banner text--align-center">
   <p>
-    <a class="common-button--text" href="https://guides.rubyonrails.org/getting_started.html" target="_blank">
-      [New Getting Started Tutorial] Build an e-commerce app with Rails 8.
+    <a class="common-button--text" href="https://rubyonrails.org/2025/3/7/apply-to-speak-at-rails-world-2025" target="_blank">
+      [Rails World 2025] CFP is now open - submit by April 10
     </a>
   </p>
 </div>

world/2025/index.html

@@ -10,7 +10,7 @@
     <h1 class="uppercase">September 4 & 5</h1>
     <h2>Beurs van Berlage, Amsterdam</h2>
 
-    <a href="https://sessionize.com/rails-world-2025" target="_blank" class="button-primary large">CFP opens March 11</a>
+    <a href="https://sessionize.com/rails-world-2025" target="_blank" class="button-primary large">Submit your talk</a>
 
     <div class="line"></div>
     <p>Tickets coming soon!</p>