Simplify server banner: static city cards, no JS, no ping, no status

- Header changed to 'Our Server Locations'
- Cards hardcoded in HTML with just city name + region
- Removed all ping JS (IIFE, pingServer, markBest, etc.)
- Removed server-ping-wrap, best-badge, server-best, ping-spinner,
  status-dot, server-optimal CSS
- Removed empty server-optimal div
- Removed card entrance animation (static display)

index.html

@@ -65,13 +65,16 @@
     <section class="server-banner" id="serverBanner">
       <div class="container">
         <div class="server-banner-header">
-          <span class="server-banner-kicker">Your optimal server</span>
-          <span class="server-banner-status" id="bannerStatus">
-            <span class="status-dot"></span> Finding your fastest route...
-          </span>
+          <span class="server-banner-kicker">Our Server Locations</span>
+        </div>
+        <div class="server-grid">
+          <div class="server-card"><div class="server-city">Amsterdam</div><div class="server-region">Netherlands</div></div>
+          <div class="server-card"><div class="server-city">Boston</div><div class="server-region">United States</div></div>
+          <div class="server-card"><div class="server-city">Manchester</div><div class="server-region">United Kingdom</div></div>
+          <div class="server-card"><div class="server-city">Mumbai</div><div class="server-region">India</div></div>
+          <div class="server-card"><div class="server-city">S&atilde;o Paulo</div><div class="server-region">Brazil</div></div>
+          <div class="server-card"><div class="server-city">Sydney</div><div class="server-region">Australia</div></div>
         </div>
-        <div class="server-grid" id="serverGrid"></div>
-        <div class="server-optimal" id="serverOptimal"></div>
       </div>
     </section>