Gitpod fail to load in browser after init

[huan]

If we add npm install to tasks.init, then the Gitpod loading in the browser will fail.

Do not do npm install in tasks.init will fix it.

tasks:
  - name: Wechaty ding-dong BOT
-     init: npm install
+     init: echo 'npm install'
    command: npm install && npm start

Wired.