Very low contrast ratio for several heading texts in light theme

[GaurangTandon]

Nature of issue?

• Found a bug

Details about the bug:

• Web browser and version: Chrome latest
• Operating System: Ubuntu 18.04
• Steps to reproduce this bug: visit editor.p5js.org

Notice the contrast ratio value. It is much below the acceptable 4.5 AA benchmark set by the WCAG. I personally also found it difficult to view the navbar items easily. The same goes for labels on the signup page, and several other sub-header texts. They could probably use a slightly darker shade of grey color.

[GaurangTandon]

PR: #926

[catarak]

This is addressed in some design changes on Zeplin that have no yet been integrated. Can you use the colors from there?

[catarak]

Fixed by #1406.