Investigate higher contrast color for buttons & links

[etrepum]

On some of the site we use orange (#FF962C) text on a white background (2.17 contrast ratio), or white text on an orange background (2.17 contrast ratio).

The Web Content Accessibility Guide suggests a minimum contrast ratio of at least 4.5 for normal text or 3 for large text. The enhanced contrast success criterion suggest 7 for normal text and 4.5 for large type.

The colors in our current palette that meet the minimum contrast ratio with white are:

• 7.12 #0058A6 blue
• 6.89 #4754A0 darkSlateBlue
• 6.73 #4B5798 victoria
• 5.6 #C21981 violet
• 4.72 #5B6CCA indigo

[etrepum]

In more recent wireframes it looks like we're mostly using violet as the primary link color so we should switch the theme around accordingly.