This PR clean up stories folder and create a new introduction that is relevant to the @jsonforms project
Export all the Gutenberg renderers into index.js file
Some notes
Trying to create different stories on the template story, while Material and Vanilla renderers work as expected, the Gutenberg did not, some error regarding to the context show up.
Note that the main form still works at http://localhost:3000/
Summary
http://localhost:3000/Reference
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