Add an onboarding flow

[joelongstreet]

Come up with a "first time" flow that explains what this tool is and how to use it. This might be a video or a "click here, next click here, next do this..."

[joelongstreet]

On first opening the page, open the examples view with a centered modal explaining what dataforms is and how it works.

[joelongstreet]

• On opening of webpage, show the examples screen
• Show a modal on the top of the example screen explaining how this project works
• Add a "fork" button on each example popover
• Add additional help details in the data entry section explaining how columns and rows work
• Hovering over an example should change it's picture. Mouse outting should restore the image to it's first state.