add Goodies page

[samumantha]

• Is goodies a good word? Or should it be merch or something else?
• Please check the image size (cannot currently build locally, size is just a guess)

Please read carfully and feel free to edit :)

[bast]

All good - thank you! - but please reduce the image size so that we have faster page load and less git repo bloat.

[samumantha]

Ah, good point, forgot.
Now reduced; for later: What is a good image size for websites?

[bast]

Ah, good point, forgot. Now reduced; for later: What is a good image size for websites?

I am aiming at 200-300 kB or less. We will need to squash-merge otherwise the big file remains in history.