Remove 'field guide · v2.0' hero label

Misleading version claim on a first public launch; h1 carries the pitch.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: mcvalosborne

index.html

@@ -823,7 +823,6 @@
 
     <section class="hero">
       <div class="container hero-content">
-        <span class="label">A field guide · v2.0 · mixer</span>
         <h1>Ghostty themes &amp; fonts, <em>mixed to taste.</em></h1>
         <p class="lede">
           Sixteen color schemes, four coding fonts, and a slider for background