HM-80. Добавил аватар с кнопкой (#43)

src/app.html

@@ -24,6 +24,8 @@
                 <div class="collapse navbar-collapse ml-5" id="navbarNavDropdown">
                     <ul class="navbar-nav"></ul>
                 </div>
+                <div class="Avatar"></div>
+                <button type="submit" class="btn btn-outline-dark text-light ml-1">Выйти</button>
         </nav>
     </template>
 

src/components/main-menu/MainMenu.css

@@ -28,3 +28,13 @@
         justify-content: center;
     }
 }
+.Avatar {
+    border-radius: 50%;
+    background-image: url('https://d5qmjlya0ygtg.cloudfront.net/569/c5295/f9ad/47c8/96a0/66a65609b38d/original/331698.jpg');
+    background-repeat: no-repeat;
+    background-position: center;
+    background-origin: border-box;
+    width: 50px;
+    height: 50px;
+    background-size: cover;
+}