Centralize app config spec

[carmenlau]

Description

Currently the app config are defined separately in different features spec, that causes the problems:

1. The app config in feature spec is not up to date
2. There is no way for us to view the whole app config

We want to centralize app config in one place. So when we add or update feature, we need to update the config spec there.

Todo:

1. Update ./features/324-config folder, remove index.md and the examples.
2. Add a full version of tenant-config.yaml
3. Add one markdown to explain what should be config per features.
4. Update all feature app config section to link to the markdown.

Portal Design

Remove this section if the feature have no Portal

Blog Post Specification

Blog Post of the Feature Release

Open Questions

Put a list of open questions here before a complete design / specification is decided

Related Issues

• Server Issues
• Client Issues
• Guides Issues