Add block sizes and weights graph

frontend/src/app/components/graphs/graphs.component.html

@@ -28,6 +28,10 @@
         [routerLink]="['/graphs/mining/block-rewards' | relativeUrl]" i18n="mining.block-rewards">
         Block Rewards
       </a>
+      <a class="dropdown-item" routerLinkActive="active"
+        [routerLink]="['/graphs/mining/block-sizes-weights' | relativeUrl]" i18n="mining.block-sizes-weights">
+        Block Sizes and Weights
+      </a>
     </div>
   </div>
 </div>