feat: onboarding security page

[rolznz]

Closes #842
Closes #823

Removes the TOS on the welcome screen and adds a new security page as the last step of the node creation process.

LDK & Cashu

LND & Phoenix

LDK (no Alby Account)

[MoritzKa]

Thanks for removing the ToS.
On the LND & Phoenix page, we could remove "LND" from point 3 and just say: "Channel backups...." , because it is for both LND and Phoenix.

[rolznz]

On the LND & Phoenix page, we could remove "LND" from point 3 and just say: "Channel backups...." , because it is for both LND and Phoenix.

@MoritzKa thanks, I will remove it. I indirectly was trying to hint that we only support channel backups on LDK which is probably useless. I changed it to this, what do you think?

[rolznz]

I have made some minor copy improvements. We can iterate on this page over time.

[MoritzKa]

@MoritzKa thanks, I will remove it. I indirectly was trying to hint that we only support channel backups on LDK which is probably useless. I changed it to this, what do you think?

Good point. We could mention both. "LND and Phoenixd channel backups are not handled ..."

But I like the suggestion: "...go back and choose the LDK node type." 👍