Onboarding flow

[therecluse26]

For new user registration since the app will likely be multi-tenant, we'll need a registration workflow.

Need to figure out the specifics, but user registration should have multiple possible entrypoints:

• The central app (openstead.app/register)
  • Allow creation of a new tenant (homestead)
  • Allow registration request for a specific tenant
    • This should initiate a registration request to be approved by a tenant admin
• A specific tenant (tenant1.openstead.app/register)
• This should initiate a registration request to be approved by a tenant admin
• Tenant admins can generate and send invite links (via email or copy/paste)

This should be done after the multitenancy feature is complete