Migrate JSON-B web site to this repository and close JSON-B organization

[jansupol]

Now we have JSON-B spec repository on GitHub in JavaEE organization which makes the current JSON-B organization (https://github.com/json-b) obsolete.

• Current web site hosted on JSON-B organization has to be migrated to gh-pages branch in this repository
• Other repositories remaining in JSON-B organization have to be transferred back to their owners
• JSON-B organization should deleted

[jansupol]

• Issue Imported From: https://github.com/javaee/jsonb-spec/issues/48
• Original Issue Raised By:@m0mus
• Original Issue Assigned To: @m0mus
• Original Issue Closed By:@m0mus

[jansupol]

@m0mus Commented Web site is migrated. Repositories of the old org are transferred to their owners. Old JSON-B organization is deleted. R.I.P.