feat: add location display for NMs

Closes #1.

app/assets/stylesheets/application.css

@@ -391,3 +391,36 @@ a:has(button) {
     font-weight: bold;
     padding: 3px 5px;
 }
+
+.map-icon svg {
+    display: inline-block;
+    width: 20px;
+    vertical-align: middle;
+    margin-top: -3px;
+    stroke: #fff;
+    fill: none;
+    position: relative;
+    z-index: 1;
+}
+
+.map-popup {
+    display: none;
+}
+
+.map-icon:hover .map-popup {
+    display: block;
+    position: absolute;
+    color: tomato;
+    z-index: 100;
+}
+
+.map-nm-loc {
+    width: 20px;
+    height: 20px;
+    border-radius: 50px;
+    opacity: .5;
+    background-color: #005ba4;
+    display: inline-block;
+    margin-left: -10px;
+    margin-top: -10px;
+}