feat: provide additional clarity around key management (#2467)

* feat: add help text for key management

There's been a number of help requests lately that seem to stem from a
misunderstanding around key management

All machines connected to sync must use the same encryption key. The key
is up to the user to manage, as if we had access to it then the
encryption wouldn't make sense.

In the future, we should verify that the key provided matches what has
been used to encrypt existing data.

* never generate a new key on login

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