Allow configuring of labels, axis and title colours

[pumbas600]

Related Problem

No response

Requested Feature

Add the following query params:

• titleColour - The colour of the title.
• labelColour - The colour of the labels.
• axisColour - The colour of the axis/ticks/axis values. (Potentially could be split into different options if needed)

Note: This should be done after #55.

Something that should be thought about: Should the defaults for this be grey (Or some other colour), or the colour value in order to preserve backwards compatibility