Create standard pocketbase seed.zip file for easy setup

[mikemitchel]

Pocketbase requires you to setup the admin user locally before it can activate fully, but with a seed backup and default migration, we can pre-load some values that make sense for someone spinning up a dev environment or on a VPS host (linux)

• make sure admin email and password work with fresh install
• have a generic staff user for non-admin logins
• 1 or 2 sample members aka the bruces
• test that a fresh deploy fires an auto migration to setup the db before startup
• steps to 'roll your own' with local setup and rsync to a remote server