add delete function to mentionable concern
add delete function to mentionable concern

cuterxy/ogx-io-web,cheunghy/ogx-io-web,ogx-io/ogx-io-web,cheunghy/ogx-io-web,cuterxy/ogx-io-web,ogx-io/ogx-io-web,ogx-io/ogx-io-web,cuterxy/ogx-io-web,cheunghy/ogx-io-web