show rainfall data

cmd/ingestd/web/index.html

@@ -146,6 +146,15 @@
               <canvas id="chart-power"></canvas>
             </div>
           </div>
+          <div class="chart-card" data-chart="chart-rain">
+            <div class="chart-header">
+              <div class="chart-title" id="chart-rain-title">Rain (24h rolling)</div>
+              <button class="chart-link" data-chart="chart-rain" title="Copy chart link">Share</button>
+            </div>
+            <div class="chart-canvas">
+              <canvas id="chart-rain"></canvas>
+            </div>
+          </div>
           <div class="chart-card wide" data-chart="chart-precip">
             <div class="chart-header">
               <div class="chart-title">Precipitation (forecast)</div>