[Billing] rework billing documentation (#1385)
* wip: rework billing documentation
* review comments from @michellehbn
* add visual explaining threshold payments
* add a blurb about PRO
* Apply suggestions from code review
Co-authored-by: Omar Sanseviero <osanseviero@gmail.com>
Co-authored-by: Michelle Habonneau <83347449+Michellehbn@users.noreply.github.com>
* Update docs/hub/billing.md
Co-authored-by: Omar Sanseviero <osanseviero@gmail.com>
* re-add support email prompt
* Apply suggestions from code review
Co-authored-by: Pierric Cistac <Pierrci@users.noreply.github.com>
* use main revision
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Co-authored-by: Omar Sanseviero <osanseviero@gmail.com>
Co-authored-by: Michelle Habonneau <83347449+Michellehbn@users.noreply.github.com>
Co-authored-by: Pierric Cistac <Pierrci@users.noreply.github.com>
