add support for hashes without leading slash

[zdila]

createHashHistory could have an option to prevent leading slash in the hash.

Instead of index.html#/foo the URL would then be index.html#foo.

[taion]

Might be worth thinking about this in conjunction with #131 and remix-run/react-router#601. It sounds like we need some flexibility in supporting various hash URL schemes to both offer appropriate legacy support and allow interop with e.g. Auth0.

[mjackson]

That's not a bad idea, @zdila, but it introduces extra complexity for not a lot of gain IMO. I think I'd rather leave it as it is now unless there's a stronger argument than aesthetics.

[zdila]

Aesthetics is a strong argument nowadays :-). In any case we'll try to implement our own HashProtocol then because feature we request is a critical issue for our customer.