Dark mode not applied correctly through the NavBar #130
Description
When using the NavBar Dark/Light mode button, the button does not correctly shifts between the modes.
The default Light mode shows the code as
<html lang="en" data-mode="light" class="light" style="color-scheme: light;">
While the Dark mode changes only the class and not the data-mode.
<html lang="en" data-mode="light" class="dark" style="color-scheme: light;">
We should update it so it does it changes the data-mode and color-scheme accordingly.
This was visible when I loaded the new theme DiamondDSTheme which relies on the data mode. It loads the light mode correctly, but on dark mode it falls back to MUI default dark colours.