Indicator colours (accessibility)

[craigfrancis]

trafficstars

From Lucas Garron: be very careful about the use of colors/security indicators.

[craigfrancis]

As to the values of these indicators, see Issue #4.

Accessibility wise, colours are not enough... in the mockup I've just re-used the green/yellow/red dots from the current Audits tab (because I can't really do visual design), along with some offscreen text (which screen-readers might be able to see)... but does not help people who are colour blind, etc.

Ideally the indicators will also include distinct/relevant shapes as well.