Create Dies theme

[Ellen-Wittingen]

I made the dies theme for this year in such a way that it can be reused every year.

When it is no longer dies, the following needs to be changed:

• the line @import 'dies-theme'; in app/styles/app.scss needs to be commented out.

When it is Dies next year, the following needs to be edited:

• the line @import 'dies-theme'; in app/styles/app.scss needs to be uncommented again
• the top four variables in app/styles/dies-theme.scss have to be changed to new colors
• the logo in public/images/dies_logo.png needs to be changed
• optional: change around what theme variables are used to color which css components in app/styles/dies-theme.scss to make the theme fit better color-wise.

Note: The public part of the website (when not logged in) remains the same colours to not confuse non-Alpha visitors / potential new members.