re-frame/docs

Understanding Event Handlers:

1. [Pure Event Handlers] TODO - write something good here
2. Effectful Handlers
3. Interceptors
4. Effects
5. CoEffects

Structuring Your Application:

1. Basic App Structure
2. Navigation
3. Namespaced Keywords

Populating Your Application Data:

1. Loading Initial Data
2. Talking To Servers
3. [Dealing With Databases] TODO - Update Subscribing to a Database docs