Update 1-install-and-setup.md to reflect typings 1.0

[shlomiassaf]

Update the docs per information from #182

Some people might not run to search the issues, so it should be on the docs.

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[shlomiassaf]

I signed it!

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[davideast]

Hi @shlomiassaf!

Thanks for taking the time with PR! We no longer use typings anymore as the library ships with the Firebase typings. So I'm going to close the PR but thank you for your time and effort!