📚 Update navbar and hero section titles to include a colon for consistency

Author: httpdss

site/index.html

@@ -114,7 +114,7 @@
   <nav class="navbar">
     <div class="container navbar-content">
       <div class="navbar-brand">
-        STRUCT
+        STRUCT:
       </div>
       <ul class="navbar-nav">
         <li><a href="#features">Features</a></li>
@@ -134,7 +134,7 @@
   <!-- Hero Section -->
   <section class="hero">
     <div class="container hero-content">
-      <h1 class="hero-title">STRUCT</h1>
+      <h1 class="hero-title">STRUCT:</h1>
       <p class="hero-subtitle">
         Powerful, flexible tool for automating project structure creation through YAML configurations.
         Generate consistent project layouts, boilerplate code, and configurations with template variables.