docs: update hero section title to reflect RVAS branding

Author: cmendible

docs/index.html

@@ -90,7 +90,7 @@
 
       <div class="wrap hero-grid">
         <div>
-          <span class="eyebrow">Agentic DevSecOps SDLC</span>
+          <span class="eyebrow">RVAS — Agentic DevSecOps</span>
           <h1 id="heroHeading">Build Your<br><span class="accent">Agentic DevSecOps Practice</span></h1>
           <p class="lede">
             Pick what your teams will stand up in production, then use GitHub to get there: