Change reactive feature on the landing page

Update the "reactive" core feature on the landing page to be more in phase with the current (and next to be) continuum page content.

_includes/header-navigation.html

@@ -15,7 +15,7 @@
         <ul class="submenu">
           <li><a href="{{site.baseurl}}/about" class="{% if page.url contains '/about/' %}active{% endif %}">WHAT IS QUARKUS?</a></li>
           <li><a href="{{site.baseurl}}/container-first" class="{% if page.url contains '/container-first/' %}active{% endif %}">CONTAINER FIRST</a></li>
-          <li><a href="{{site.baseurl}}/continuum" class="{% if page.url contains '/continuum/' %}active{% endif %}">REACTIVE</a></li>
+          <li><a href="{{site.baseurl}}/continuum" class="{% if page.url contains '/continuum/' %}active{% endif %}">CONTINUUM</a></li>
           <li><a href="{{site.baseurl}}/developer-joy" class="{% if page.url contains '/developer-joy/' %}active{% endif %}">DEVELOPER JOY</a></li>
           <li><a href="{{site.baseurl}}/kubernetes-native" class="{% if page.url contains '/kubernetes-native/' %}active{% endif %}">KUBERNETES NATIVE</a></li>
           <li><a href="{{site.baseurl}}/standards" class="{% if page.url contains '/standards/' %}active{% endif %}">STANDARDS</a></li>

_includes/homepage-features-icon-band.html

@@ -14,8 +14,8 @@ <h3><a href="/container-first">Container First</a></h3>
     <div class="width-4-12 width-12-12-m contrib-block">
       <img class="light-only" src="{{site.baseurl}}/assets/images/about/icon-reactive.svg">
       <img class="dark-only" src="{{site.baseurl}}/assets/images/about/icon-reactive-dark.svg">
-      <h3><a href="/continuum">Unifies imperative and reactive</a></h3>
-      <p>Combine both the familiar imperative code and the reactive style when developing applications.</p>
+      <h3><a href="/continuum">Reactive Core</a></h3>
+      <p>Built on a robust reactive core, Quarkus ensures fast and efficient performance, supporting the development of a wide variety of modern applications.</p>
     </div>
     <div class="width-4-12 width-12-12-m contrib-block">
       <img class="light-only" src="{{site.baseurl}}/assets/images/about/icon-standards.svg">