Add dark mode to default layout

[CodeWithMa]

Edit the files in https://github.com/srid/emanote/tree/master/default/templates and add dark colors.

I guess the only thing to do is adding dark:bg-black etc. in addition to the current colors and tailwind does everything automatically.

See https://tailwindcss.com/docs/dark-mode.

[mak1A4]

+1 for this