Moved colour scheme toggle and squashed commits (#433)

Jian Liew

25.17.2020 6c3a33291178693c31fbfdda663a8586b84a96f6

 assets/scss/_navigation.scss

@@ -74,6 +74,10 @@
    margin: 1.7rem 0;
    font-size: 2.4rem;
    line-height: inherit;
    bottom: 2rem;
    left: 2rem;
    z-index: 100;
    position: fixed;
  }
  #menu-toggle {
    display: none;