added tabs with content on badge

[DecentralizedDan]

• updated index.html
• added badge.js to control tab behavior
• updated style.css to support tabs and content

After clicking the toggle:

[jmercouris]

Thank you Dan, this looks way better. I really like it!

Interesting approach to use the div with dash item instead of styling a ul and li. I guess it doesn't truly matter since our page is not meant to be parsed by machines/semantically understood, however it does feel a bit odd :-)

[jmercouris]

Thank you Dan!