auto switch repo based on current language

[drafish]

Here are the build-in repos

export const repoMap = {
  en: {
    name: 'ethereum/remix-workshops',
    branch: 'master',
  },
  zh: {
    name: 'ethereum/remix-workshops',
    branch: 'cn',
  },
}

Just add them into repoMap, if there are any other repos of other languages.

@ryestew You need to update the chinese repo, it's not the latest.