Update screenshot in appdata
The screenshot specified in the appdata file, which is visible in GNOME Software/on Flathub, was taken before the game's modernization. We should replace it with a new one (or even add 2-3 more).
<screenshot height="608" width="972" type="default"> <image>https://people.gnome.org/~mcatanzaro/gnome-nibbles.png</image> </screenshot>
So I think what we should do is:
- Come up with 2-3 screenshots we can use
- See where other applications store their screenshots (maybe we can even commit them in the repo and let gitlab statically serve them?)
- Update the appdata file with the new paths