Making most of this ticket after the fact for documentation purposes.
We just want to add light mode to the website. This includes:

1. Creating a new global state in Redux
2. Have an option to toggle this state
3. Have our website respond to this state

The work on this task also centralizes our colours by storing them in css variables.
The remainder of this task would include storing our new colours in variables as well by modifying variables.css

grey - #7D7D7D
blue - #0059EB
purple - #8F42D9
pink - #E7006E
red - #E60F26
yellow - #FF9200
green - #009534
teal - #00937C