[Config] Add command line options for docset_icon, docset_path, and source_directory.
[Config] Add command line options for docset_icon, docset_path, and source_directory.

AliSoftware/jazzy,pcantrell/jazzy,PSPDFKit-labs/jazzy,agentk/jazzy,Kapeli/jazzy,emiscience/jazzy,johndpope/jazzy,mbogh/jazzy,1ec5/jazzy,realm/jazzy,1ec5/jazzy,PSPDFKit-labs/jazzy,Kapeli/jazzy,mbogh/jazzy,jeeftor/jazzy,jeeftor/jazzy,agentk/jazzy,jeeftor/jazzy,emiscience/jazzy,agentk/jazzy,realm/jazzy,Kapeli/jazzy,pcantrell/jazzy,AliSoftware/jazzy,johndpope/jazzy,1ec5/jazzy,mbogh/jazzy,AliSoftware/jazzy,johndpope/jazzy,pcantrell/jazzy,emiscience/jazzy