Privacy workshop: correct Lightning and ecash privacy claims

[code-orange-dev]

The workshop page taught a few things the new Privacy Sessions directly contradict (S10 is literally called Lightning Doesn't Fix This):

• Removed the quote "Really difficult to track a lightning payment if 3 lightning hops are performed". Hops through custodial wallets (Wallet of Satoshi, Blink) add parties who see the payment. The page now teaches what each hop can and can't see, plus probing and invoice linkage, and mentions BOLT12 and blinded paths
• "Fedimint... complete privacy" and "complete privacy chain" now name the actual trade-offs (custodial trust, swap provider, timing)
• The run-this-workshop demo step now has attendees list what each operator learned
• Added a Go Deeper link to the Privacy Sessions (Privacy Track Season One: open with Silent Payments, new labs, review-first curriculum#2)

I left the event history table as-is, since it's a record of what happened.

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