Update copyright year to 2026

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: vthorsteinsson

templates/about.html

@@ -107,7 +107,7 @@
             " /></a>
       </p>
       <p>
-        <b>Höfundaréttur &copy; 2025 Miðeind ehf.</b>
+        <b>Höfundaréttur &copy; 2026 Miðeind ehf.</b>
         <br />
         <span>[Þróunarútgáfa]</span>
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