Create a function to display the color sequence on game board

[LionOnTheWeb]

Blocked by #17, #19

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Overview

As a Jervis-Tetch player, I want to be able to see the highlighted color sequence on the game board.

Tasks

• [ ] Create a displaySequence() function
• [ ] Add highlight class for buttons in a random sequence to highlight their colors temporarily
• [ ] Add promise to function to be able to start the next color highlight with a setTimeout
• [ ] Utilize hsl to easily add highlight per color

[LionOnTheWeb]

HSL example:

:root {
    --colorHue = <number 0 - 255>
    --lighting = <percentage 0 - 100>
}

.button:nth-child(<number>) {
    --colorHue = <number>

    &.highlight {
         --lighting = <higher percentage value>
    }
}