Draws a timeline based on an array of dates
var milestoneDates = [
{
date:2020.6, // the date as a decimal year
title: "Milestone Title", // title to display
below: false, // show above or below the snake
description: "Milestone Description" //description
},
{
date:2021.2,
title: "Milestone Title",
below: true,
description: "Milestone Description"
}
]