remove known world (#914)

## Description:
Remove known world map to avoid copyright infringement.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

<DISCORD USERNAME>

src/client/components/Maps.ts

@@ -24,7 +24,6 @@ export const MapDescription: Record<keyof typeof GameMapType, string> = {
   Iceland: "Iceland",
   Japan: "Japan",
   BetweenTwoSeas: "Between Two Seas",
-  KnownWorld: "Known World",
   FaroeIslands: "Faroe Islands",
   DeglaciatedAntarctica: "Deglaciated Antarctica",
   FalklandIslands: "Falkland Islands",