feat: old config and environment is not use anymore

BREAKING CHANGE: remove old config and environment

Signed-off-by: BoHong Li <raccoon@hackmd.io>

Author: a60814billy

lib/config/hackmdEnvironment.js

@@ -36,12 +36,9 @@ const fileConfig = fs.existsSync(configFilePath) ? require(configFilePath)[env]
 
 let config = require('./default')
 merge(config, require('./defaultSSL'))
-merge(config, require('./oldDefault'))
 merge(config, debugConfig)
 merge(config, packageConfig)
 merge(config, fileConfig)
-merge(config, require('./oldEnvironment'))
-merge(config, require('./hackmdEnvironment'))
 merge(config, require('./environment'))
 merge(config, require('./dockerSecret'))