Remove dead code and add docs.
Remove dead code and add docs.

durai145/github,cocktail-io/github,piotrmurach/github,MalachiTatum/github,peter-murach/github,samphilipd/github,GistBox/github,joshsoftware/github,yaoxiaoyong/github,davengeo/github,befairyliu/github,wicky-info/github,anabhilash619/github,firstval/github