Moved colour scheme toggle and squashed commits (#433)

Jian Liew

25.17.2020 6c3a33291178693c31fbfdda663a8586b84a96f6

 assets/scss/_base.scss

@@ -217,3 +217,11 @@
  margin: 0 .05em 0 .1em;
  vertical-align: -0.1em;
}

#dark-mode-toggle {
  bottom: 2rem;
  left: 2rem;
  z-index: 100;
  position: fixed;
  font-size: 1.6em;
}