Users: get current user, onboard current user features

src/app/shared/components/navbar/navbar.html

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+<nav class="navbar is-fixed-top">
+  <div class="navbar-brand"></div>
+  <div class="navbar-menu">
+    <div class="navbar-start"></div>
+    <div class="navbar-end">
+      <!-- User menu dropdown -->
+      <div class="navbar-item has-dropdown is-hoverable">
+        <a href="" class="navbar-link is-arrowless">
+          <div class="media">
+            <div class="media-left">
+              <div class="image is-24x24" [class.is-skeleton]="!sharedStore.isCurrentUserLoaded()">
+                <img
+                  class="is-rounded"
+                  [src]="sharedStore.getCurrentUserAvatarUrl()"
+                  [alt]="sharedStore.getCurrentUserName()">
+              </div>
+            </div>
+            <div class="media-content">
+              <p [class.is-skeleton]="!sharedStore.isCurrentUserLoaded()">
+                {{sharedStore.getCurrentUserName()}}
+              </p>
+            </div>
+          </div>
+        </a>
+        <div class="navbar-dropdown">
+          <a (click)="logout()" class="navbar-item">Log out</a>
+        </div>
+      </div>
+      <!-- End of user menu dropdown -->
+    </div>
+  </div>
+</nav>