Move zh-hk to zh-yue as the present translation in zh-hk is in Cantonese form (mostly used in spoken and colloquial context and unsuitable for most development projects), and create a new zh-hk for standard written Chinese in Hong Kong
Modify zh-HK.yml to Formal Chinese
Rename zh-yue to zh-YUE
Add back the renamed file
minor fix to preserved zh-YUE.yml
Merge pull request #423 from hlaw/zh-hk-formal

Modify zh-hk to use formal Chinese writing instead of Cantonese