[CL-133] add skip links to bit-layout (#7213)

* Add light LinkType to link directive

* add skip link to bit-layout; update i18n for all apps

* install storybook interaction testing packages

* update storybook config

* add skiplink story to bit-layout

* update route and focus logic

* remove focus ring

libs/components/src/layout/layout.component.html

@@ -1,3 +1,18 @@
+<div
+  class="tw-fixed tw-z-50 tw-w-full tw-flex tw-justify-center tw-opacity-0 focus-within:tw-opacity-100 tw-pointer-events-none focus-within:tw-pointer-events-auto"
+>
+  <nav class="tw-bg-background-alt3 tw-rounded-md tw-rounded-t-none tw-py-2 tw-text-alt2">
+    <a
+      bitLink
+      class="tw-mx-6 focus-visible:before:!tw-ring-0"
+      [fragment]="mainContentId"
+      [routerLink]="[]"
+      (click)="focusMainContent()"
+      linkType="light"
+      >{{ "skipToContent" | i18n }}</a
+    >
+  </nav>
+</div>
 <div class="tw-flex tw-w-full">
   <aside
     [ngStyle]="
@@ -12,7 +27,11 @@
   >
     <ng-content select="[slot=sidebar]"></ng-content>
   </aside>
-  <main class="tw-ml-60 tw-min-h-screen tw-min-w-0 tw-flex-1 tw-bg-background tw-p-6">
+  <main
+    [id]="mainContentId"
+    tabindex="-1"
+    class="tw-ml-60 tw-min-h-screen tw-min-w-0 tw-flex-1 tw-bg-background tw-p-6"
+  >
     <ng-content></ng-content>
   </main>
 </div>