message: fix(aio): adjust SideNav top to avoid extra whitespace
  Partially addresses
diff: @@ -25,15 +25,17 @@ aio-nav-menu {
  md-sidenav.mat-sidenav.sidenav {
  position: fixed;
  + top: 64px;
  bottom: 0;
  left: 0;
  - padding: 80px 0px 0px;
  + padding: 0;
  min-width: 260px;
  background-color: $offwhite;
  box-shadow: 6px 0 6px rgba(0,0,0,0.10);
  + height: calc(100vh - 64px);
  &.collapsed {
  - padding-top: 64px;
  + top: 56px;
  }
  }
  