add functionality to share faq item

[jakubabrzy]

In this PR click on the item add a hash to the link, after sharing the link the single faq item is open

closes #37

[damianstasik]

Thanks for taking care of this one!

Two things I see that may need an iteration are:

1. This should only work on the FAQ page, but it works on homepage too.
2. I don't know what we are going to put as questions, so maybe we could simplify the hash we store in the url.

[damianstasik]

Looks and works great! We just need to sync FAQ changes, either merge finalized FAQ and update this PR or other way around.

[Roma36]

Works great!