Consolidate engine docs and naming

src/config/game-config.ts

@@ -1,7 +1,7 @@
 import path from 'path';
 import { existsSync, mkdirSync, readFileSync } from 'fs';
 
-export type EngineName = 'yaml' | 'ink' | 'zork' | string;
+export type EngineName = 'yaml' | 'ink' | 'zcode' | string;
 
 export interface GameMetadata {
   title: string;
@@ -40,7 +40,7 @@ function fallbackConfig(engine: EngineName): GameEngineConfig {
       mainGameFile:
         engine === 'ink'
           ? 'data/ink/story.ink.json'
-          : engine === 'zork'
+          : engine === 'zcode'
             ? 'data/z-code/zork1.bin'
             : 'data/worlds/example_world.yml',
       music: 'public/music',