New page for Bitcoin and quantum threat

Thank you for your offer!

After consideration, due to Focus on low-effort maintainability at this time no review of any substantial PQCrypto documentation contributions will be accepted. This is because no trusted expert reviewer contributors knowledgeable on PQCrypto for crypto currencies is available. Seems like @HulaHoop is unavailable. Therefore Whonix cannot become a primary source for detailed cryptocurrency PQCrypto content.

We can and should however add a short mention that PQCrypto is a problem for Bitcoin / crypto currencies and leave it to the user to do their own research.

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