Move map generator into main repo (#2006)

## Description:

Move the MapGenerator repo into OpenFrontIO so we don't need to copy
generated map files over.

## 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:

evan

package.json

@@ -14,7 +14,8 @@
     "format": "prettier --ignore-unknown --write .",
     "lint": "eslint",
     "lint:fix": "eslint --fix",
-    "prepare": "husky"
+    "prepare": "husky",
+    "gen-maps": "cd map-generator && go run . && npm run format"
   },
   "lint-staged": {
     "**/*": [