Onboard a Block
Create a Block with its GPs and invite its first Block Admin.
Onboard a Block walks through four steps.
Block details: the short code (2 to 6 capital letters or digits, for example
SHY1; it appears in complaint and consignment numbers and cannot change later), the Block's name in each
language, and the district.

GPs and wards: each GP and its number of wards, typed in or imported from CSV
(name_en, name_bn, name_hi, wards). The Block Admin can add more later.

Block Admin: the first Block Admin's name, mobile number and language.

Review: check, then Create Block and invite admin. The Block starts in setup.
