Remove GitHub Copilot Workshops hero badge from all pages

Removed the hero-badge element from the English, Portuguese, and
Spanish versions of the site.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: brunoborges

es/index.html

@@ -66,7 +66,6 @@
 
     <section class="hero">
         <div class="container">
-            <div class="hero-badge">🎓 Talleres de GitHub Copilot</div>
             <h1>GitHub Copilot Dev Days</h1>
             <p class="hero-subtitle">Talleres prácticos para dominar GitHub Copilot en todos los IDEs, lenguajes y flujos de trabajo. Elige tu stack, construye algo real y mejora tus habilidades de desarrollo con IA.</p>
             <div class="hero-cta">

index.html

@@ -66,7 +66,6 @@
 
     <section class="hero">
         <div class="container">
-            <div class="hero-badge">🎓 GitHub Copilot Workshops</div>
             <h1>GitHub Copilot Dev Days</h1>
             <p class="hero-subtitle">Hands-on workshops to master GitHub Copilot across every IDE, language, and workflow. Pick your stack, build something real, and level up your AI-powered development skills.</p>
             <div class="hero-cta">

pt_BR/index.html

@@ -66,7 +66,6 @@
 
     <section class="hero">
         <div class="container">
-            <div class="hero-badge">🎓 Workshops do GitHub Copilot</div>
             <h1>GitHub Copilot Dev Days</h1>
             <p class="hero-subtitle">Workshops práticos para dominar o GitHub Copilot em todos os IDEs, linguagens e fluxos de trabalho. Escolha sua stack, construa algo real e eleve suas habilidades de desenvolvimento com IA.</p>
             <div class="hero-cta">