fix(category-list): bad routerLink path with relativeLinkResolution (#663)

needed with the router's `relativeLinkResolution: 'corrected'`

Fixes #661

Author: Splaktar

material.angular.io/src/app/pages/component-category-list/component-category-list.html

@@ -2,7 +2,7 @@
 <div class="docs-component-category-list">
   <a *ngFor="let category of docItems.getCategories((params | async)?.section)"
      class="docs-component-category-list-item"
-    [routerLink]="['../', category.id]">
+    [routerLink]="[category.id]">
     <mat-card class="docs-component-category-list-card">
       <mat-card-title>{{category.name}}</mat-card-title>
       <mat-card-content class="docs-component-category-list-card-summary">{{category.summary}}</mat-card-content>