fix: improve vault setup experience

[jahvon]

A variety of changes that improves the experience of creating a vault. Includes the --set flag, a clean way of getting the generated token, and some docs updates

[codecov]

Codecov Report

Attention: Patch coverage is 36.84211% with 12 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/io/vault/view.go	0.00%	7 Missing ⚠️
cmd/internal/vault.go	33.33%	3 Missing and 1 partial ⚠️
internal/vault/v2/vault.go	83.33%	1 Missing ⚠️

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