Support of board name parameter.

src/app/boards/boards.component.html

@@ -1,11 +1,12 @@
 <div class="wrappe">
 <img src="http://static.vdk2ch.ru:15555/test-public/16657431265390.png" alt="свiня" width="150">
 <app-send-post></app-send-post>,
-<button (click)="refreshPosts()">Обновить</button>
+  <h2>/postgres/</h2>
+<button (click)="refreshPosts('postgres')">Общий раздел</button>
 <post-single
   *ngFor="let post of postsToShow" [post]="post"
 ></post-single>
-<button (click)="refreshPosts()">Обновить</button>
+<button (click)="refreshPosts('postgres')">Обновить</button>
 <br>
 <div class="hexagon">
   <div class="hexagon-inside">
@@ -13,4 +14,4 @@
     </div>
   </div>
 </div>
-</div>
+</div>