Move billing overview into project addition

[comradekingu]

This is ~Billing overview or somesuch,

In my head that belongs with ~Buy new hosting plan over in

no?

[github-actions]

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[nijel]

That's not about adding new billing, but to manage existing ones.

For most users this will just redirect to the only billing they have, for others it displays a list of them without an option to add a new one, so why it should be in the add menu?