Email Accessibility - Contrast too low

[edent]

Describe the bug
Current email colours fail WCAG guidance on text contrast.

To Reproduce
Steps to reproduce the behavior:

1. Receive an email with an update.
2. Try to read the text at the top and bottom (e.g. " This email was sent automatically, from an unmonitored email account. Please do not reply to it."
3. Hurt your eyes

Expected behavior
The current text colour is #4E646B; the background is #42494C. This is an accessibility failure - https://www.siegemedia.com/contrast-ratio#%234E646B-on-%2342494C

Screenshots

Desktop (please complete the following information):

• OS: Linux
• Browser: Firefox
• Version: 134.0.2 (64-bit)

Additional context

The problem occurs at

fixmystreet/templates/email/default/_email_settings.html

Line 23 in ed9a799

body_text_color = color_gunmetal_light

Changing it to color_blue_pale will fix the contrast issue.

[dracos]

Thanks; perhaps we should actually drop the line entirely, it's only repeating the heading just below. I wonder if there's circumstances where it's saying something more useful, we can check.