Implement Header Menu Left

src/app/ui/header-menu/header-menu.html

@@ -1 +1,11 @@
-<p>header-menu works!</p>
+<div class="menu-left">
+  <div class="brand">
+    <img src="/logo_inverted.svg" alt="logo"/>
+    <span>ADOFAI Editor Forum</span>
+  </div>
+
+  <span>Levels</span>
+  <span>Community</span>
+  <span>Leaderboard</span>
+  <span>About</span>
+</div>