Add links to extension and live site, shrink sample CSV

Replace the 822-row sample with a 6-row example.csv. Link the Outlier Saver
extension from the README and both empty screens. Set nginx server_name to
outliers.viaproger.ru.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

index.html

@@ -124,6 +124,9 @@
   .link:not(:disabled):hover { color: var(--on); }
   .link:disabled { opacity: .35; }
 
+  .screen .hint { font-size: 13px; }
+  .screen .hint a { text-decoration: underline; text-underline-offset: 3px; }
+
   /* ---------- Done screen ---------- */
   .summary { display: flex; gap: 28px; margin: 4px 0; font: 400 12px/1.3 var(--f-mono); letter-spacing: .04em; text-transform: uppercase; color: var(--muted); }
   .summary b { display: block; font: 600 30px/1.1 var(--f-display); letter-spacing: -.04em; color: var(--ink); }
@@ -173,6 +176,7 @@
       <div class="row">
         <button class="btn primary" id="pickBtn">Выбрать файл</button>
       </div>
+      <p class="hint">Нет файла? Его создаёт <a href="https://gitea.viaproger.ru/volochay/outlier-saver-extension" target="_blank" rel="noopener">расширение Outlier Saver</a>.</p>
     </div>
   </div>
 </main>