add readme and change some scripts

scripts/fix_image.js

@@ -1,25 +0,0 @@
-#!/bin/env node
-
-import GameCommon from '../common/GameCommon.js'
-import { logger } from '../common/Util.js'
-import GameStorage from '../server/GameStorage.js'
-
-const log = logger('fix_image.js')
-
-function fix(gameId) {
-  GameStorage.loadGame(gameId)
-  let changed = false
-
-  let imgUrl = GameCommon.getImageUrl(gameId)
-  if (imgUrl.match(/^\/example-images\//)) {
-    log.log(`found bad imgUrl: ${imgUrl}`)
-    imgUrl = imgUrl.replace(/^\/example-images\//, '/uploads/')
-    GameCommon.setImageUrl(gameId, imgUrl)
-    changed = true
-  }
-  if (changed) {
-    GameStorage.persistGame(gameId)
-  }
-}
-
-fix(process.argv[2])