Refactor code structure for improved readability and maintainability

index.html

@@ -55,6 +55,7 @@
             <option value="pheromone">Trade trails</option>
             <option value="pressure">Population pressure</option>
             <option value="cities">Cities</option>
+            <option value="polities">Polities</option>
           </select>
         </label>
       </section>
@@ -67,6 +68,7 @@
           <div><dt>Urban population</dt><dd id="urbanPopulation">0</dd></div>
           <div><dt>Ethnicities</dt><dd id="ethnicities">0</dd></div>
           <div><dt>Cities</dt><dd id="cities">0</dd></div>
+          <div><dt>States</dt><dd id="polities">0</dd></div>
           <div><dt>Trade routes</dt><dd id="routes">0</dd></div>
           <div><dt>Collapse deaths</dt><dd id="deaths">0</dd></div>
           <div><dt>Frame cost</dt><dd id="frameCost">0ms</dd></div>