sign-machine Version 2.0 alpha

• Reboot of the project, conversion from PHP + JS, to Javascript, Bug #1,
• Deleted legacy PHP and JS files,
• Aim for ease-of-use, no-config embedding,
• Optional configuration via HTML data attribute,
• README documentation (legacy and version 2.x),
• Licensed as open source: MIT license

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• Tag: 2.0-alpha