Change colors to not be as similar to each other

[jeremystucki]

Please add them here: https://github.com/lost-university/web/blob/5f4916445bc5b0e4552336710ddbea8d15291cb0/src/helpers/color-helper.ts

[vinazahnd]

[StefanieJaeger]

Please wait until after PR #90, since we are introducing new colors.