Remove hardcoded numPlayersConfig, calculate it based on the maps land tiles 🔧 (#2874)

## Description:

The calculation is based on: 50 players per 1_000_000 land tiles,
limited at 125 players because of performance
Second number is 75% of that, third one 50%
That way, the player counts are staying mostly the same
Look at the "Dynamic Config" column, these are the new player counts:
(The 125 players limit is missing in that column, only relevant for the
twolakes map)

<img width="930" height="1033" alt="Screenshot_2026-01-12_152758"
src="https://github.com/user-attachments/assets/e1791740-e263-47b3-8b27-4f9aa358d381"
/>
<img width="926" height="324" alt="Screenshot_2026-01-12_152814"
src="https://github.com/user-attachments/assets/78d6789b-374f-4f8b-b50f-f6f08395572b"
/>

This PR also removes `MapDescription` from `Maps.ts` because its unused.
And this PR updates the map-generator `README.md` to reflect the changes

## Please complete the following:

- [X] I have added screenshots for all UI updates
- [X] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [X] I have added relevant tests to the test directory
- [X] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

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

FloPinguin

tests/util/TestServerConfig.ts

@@ -1,6 +1,6 @@
 import { JWK } from "jose";
 import { GameEnv, ServerConfig } from "../../src/core/configuration/Config";
-import { GameMapType, PublicGameModifiers } from "../../src/core/game/Game";
+import { PublicGameModifiers } from "../../src/core/game/Game";
 import { GameID } from "../../src/core/Schemas";
 
 export class TestServerConfig implements ServerConfig {
@@ -49,7 +49,7 @@ export class TestServerConfig implements ServerConfig {
   gameCreationRate(): number {
     throw new Error("Method not implemented.");
   }
-  lobbyMaxPlayers(map: GameMapType): number {
+  async lobbyMaxPlayers(): Promise<number> {
     throw new Error("Method not implemented.");
   }
   numWorkers(): number {
@@ -82,7 +82,7 @@ export class TestServerConfig implements ServerConfig {
   getRandomPublicGameModifiers(): PublicGameModifiers {
     return { isCompact: false, isRandomSpawn: false };
   }
-  supportsCompactMapForTeams(map: GameMapType): boolean {
+  async supportsCompactMapForTeams(): Promise<boolean> {
     throw new Error("Method not implemented.");
   }
 }