refactor(sponsors): simplify BrainStation logo and update gold layout

- Extract only brain icon from BrainStation logo SVG
- Change gold sponsors layout from 2 columns to 3 columns

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: mrleeio

_includes/sponsor_logos/brainstation.html

@@ -1,3 +1,3 @@
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+<svg viewBox="0 0 28 28" style="height: 5em; width: auto;" fill="currentColor">
+  <path d="M11.525 13.27L3.098 8.302l8.428-5.376V13.27zm-8.96 5.863l8.96-3.789.001 8.94-8.96-5.151zm4.42 7.463l-4.482-6.024 8.594 4.912-4.112 1.112zM2.162 9.21l8.64 5.077-9.36 3.962.72-9.039zm6.315-7.82l2.228.55-6.022 3.83 3.794-4.38zm3.803-.375L8.485.024a.8.8 0 00-.793.249L1.158 7.859a.925.925 0 00-.217.517L.083 19.142a.894.894 0 00.168.585l5.895 7.96a.78.78 0 00.83.285l5.31-1.479a.766.766 0 00.565-.737l-.002-10.932.002-13.073a.763.763 0 00-.57-.737zm4.738 13.271l8.64-5.077.72 9.04-9.36-3.963zm3.816 12.31l-4.111-1.112 8.594-4.912-4.483 6.024zm-4.54-11.252l8.96 3.789-8.96 5.151v-8.94zm8.428-7.043l-8.427 4.97-.001-10.346L24.722 8.3zm-5.38-6.912l3.794 4.382-6.02-3.832 2.226-.55zm7.32 6.47L20.127.273a.8.8 0 00-.793-.249l-3.795.99a.763.763 0 00-.57.737l.001 13.073v10.932c0 .344.23.647.563.737l5.31 1.479a.78.78 0 00.83-.284l5.895-7.961a.896.896 0 00.168-.585L26.88 8.376a.928.928 0 00-.217-.517z" fill-rule="evenodd"/>
 </svg>

index.html

@@ -143,7 +143,7 @@ <h3 class="fs-2 text-body-emphasis">18+ Years</h3>
 {% if gold_sponsors.size > 0 %}
 <div class="container my-5">
 <h2 class="pb-2 border-bottom text-warning">Gold Sponsors</h2>
-<div class="row g-5 py-5 row-cols-1 row-cols-lg-2">
+<div class="row g-5 py-5 row-cols-1 row-cols-lg-3">
   {% for company in gold_sponsors %}
   <div class="feature col">
     <a href="{{ company.website }}" target="_blank"