Map organizations to the accounts

[This list of accounts](https://github.com/github/government.github.com/blob/gh-pages/_data/governments.yml) is really impressive, but since they aren't mapped to which organization they belong to, it's hard to reuse the data in any kind of automated way (like batch importing it to Wikidata). Can it be added as a key for each account?

從 _data/governments.yml 開始，該檔案包含 issue 中描述的帳戶，並檢查每個帳戶的結構。為每個帳戶新增一個 organization 鍵，讓此清單可用於自動匯入，並在每個項目中包含預期的組織對應。

由索引模型根據 Issue 內容生成。