Add more appropriate screengrab to docs

[Goosius1]

• Instead of Europe, use a small screengrab of a random world, including wasteland provinces also

[AToska21]

• Instead of Europe, use a small screengrab of a random world, including wasteland provinces also

wasteland provinces? what are those?

[Goosius1]

Those are now described in the user guide: https://github.com/TownyAdvanced/TownyProvinces/blob/master/README.md

[Goosius1]

Note: Since the addition of protected regions, a Europe map may still be appropriate, as long as you can show some wasteland (maybe deserts near the bottom?)

[Goosius1]

Screengrab added