Added ⚡️ content to Private Key Management > External Signing Devices

[Bosch-0]

⚡ Live preview

Closes#546

• Added LN content where relevant.
• Re-framed this page to focus on 'External Signers' as a concept not just hardware wallets. Changed page name to External Signers from External Signing Devices to reflect this.
• Added image to 'How it works' section.
• Other minor formatting changes

[GBKS]

Great update, thank you for tackling this.

One future addition I could see is that of a smart auto-signer based on specific rules (auto-sign low amounts, based on allowances, etc).

For the list of products at the bottom, have there been any changes? Muun, for example, is a 2-of-2 with their service functioning as an auto-signer.

[Bosch-0]

Removed that image in favour of adding a more detailed carousel (#561) showing how this scheme works, thoughts @GBKS?

[pavlenex]

Great page. Will need a bit of work once lighnting signers become the thing.

One thing that was unclear to me is the PSBT part. It isn't my impression that all external signers use PSBT, left comments on relevant places where I'd appreciate clarificaiton.

Besides that just a couple of minor nits. And of course the conflict in image compression that needs to be resolved 😺

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[pavlenex]

Great work thanks for addressing the changes quickly 🚀

[pavlenex]

@GBKS This PR requires your re-review since it's blocked by request a change 😄

[GBKS]

All looks good now, thanks for the updates.

I noticed that the Overview page still refers to "External signing device" in the recommendation box, the diagrams, and the image and link under "Personal schemes". Can you address this here, or should we create a new PR for those tweaks?

[Bosch-0]

Can address is a new PR, will get on to that asap :)

[pavlenex]

LGTM, let's address the stuff @GBKS mentioned in a different PR.

[pavlenex]

@GBKS Needs your approval to get merged.

[GBKS]

Great update, especially with the reframing to get away from the device focus.