💄 change headings

src/app/discs-chart/factor-year-graph/factor-year-graph.component.html

@@ -1,4 +1,4 @@
-<h2>Rural attractiveness index of region {{region}} in {{yearGraphService.selectedYear}}</h2>
+<h3>Rural attractiveness index of region {{region}} in {{yearGraphService.selectedYear}}</h3>
 <div *ngIf="sdmDihService.yearsLoaded; else loading">
   <!--select
     class="form-select form-select-lg mb-3"