Remove 'welcome' from top-left menu

Tjis is quite confusing as the welcome page is designed for when
you're not logged in, ie. has a sign-in button. There's also no way
to get back into the app so it really looks like it's logged you
out.

Reverts 116367fd69

res/css/views/context_menus/_TopLeftMenu.scss

@@ -31,10 +31,6 @@ limitations under the License.
             mask-image: url('$(res)/img/feather-icons/home.svg');
         }
 
-        li.mx_TopLeftMenu_icon_welcome::after {
-            mask-image: url('$(res)/img/feather-icons/gift.svg');
-        }
-
         li.mx_TopLeftMenu_icon_settings::after {
             mask-image: url('$(res)/img/feather-icons/settings.svg');
         }

res/img/feather-icons/gift.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1" stroke-linecap="round" stroke-linejoin="round" class="feather feather-gift"><polyline points="20 12 20 22 4 22 4 12"></polyline><rect x="2" y="7" width="20" height="5"></rect><line x1="12" y1="22" x2="12" y2="7"></line><path d="M12 7H7.5a2.5 2.5 0 0 1 0-5C11 2 12 7 12 7z"></path><path d="M12 7h4.5a2.5 2.5 0 0 0 0-5C13 2 12 7 12 7z"></path></svg>