Retro 29.2 and 29.3 Improve Documentation Standards for BC Registries Application

**Description**

There is currently no consistent documentation standard across the BC Registries application, which makes onboarding, troubleshooting, and knowledge sharing difficult.

This ticket is to define simple documentation standards/templates and identify key documentation gaps so information is easier to maintain and access across the team.

**Acceptance Criteria**

- [ ] Define basic documentation standards/templates
- [ ] Identify major documentation gaps
- [ ] Align on ownership and maintenance expectations
- [ ] Share/document where documentation should be stored