Transition work item from CCG to VCWG

[decentralgabe]

• Create a new directory to house the old CCG work
• Create a directory to house current version spec text
• Remove any CCG references/branding
• Change the github.io reference on the "About" part of the github home page to point at W3C
• Add some common tags, some of them (namely vc-wg) is used by some of the tools
• Add a bunch of groups on the contact list of the repo
• Update the document to note that the spec is now an "ED" (Editor's Draft)

[decentralgabe]

done in #132