Adjust Discourse theme constrast

[anadahz]

The dark theme of cafe.privacylx.org is not always readable by anyone and on all weather and light conditions. A theme with more contrast can improve readability for users with bad vision, on low quality monitors and reading on smaller screens and bad lighting.

I suggest to add an option for a user to switch to a brighter higher contrast theme version via a day/night button. An example with screenshots taken from android-x86 website:

[francisco-core]

(New) White theme

There are some people that do prefer a white theme, which is understandable. So here it is!

How to change to the white version

On the hamburger menu up at the top there is now an option to select the theme

This was done though a theme component for discourse: https://meta.discourse.org/t/hamburger-theme-selector/61210

[anadahz]

Great, thank you for implementing this!