Remove href="#" references to be compatible with frontend routers (i.e react-router)

[gtrias]

Having href="#" in components breakes react-router route handling. Also it has not real use but having proper cursor over links.

Related: https://github.com/alvarium/react-json/pull/1, https://github.com/alvarium/react-json/commit/382dd348836c68c451a0aa47462cc8c5c699f5bd

Maybe it can be removed in components. I can make a PR if needed.