Document publish lifecycle, with hooks and plugins

[noahnu]

Is your feature request related to a problem? Please describe.

Add documentation with a diagram for all the lifecycle scripts and where hooks/plugins interact with the pipeline.

Describe the solution you'd like

Describe alternatives you've considered

Additional context

[noahnu]

Added lifecycle documentation, but we can still use a diagram for the plugins.

[Papooch]

As far as I know, there is only one plugin entry point, which is the onReleaseAvailable. Is a diagram really needed?

[noahnu]

It'd be living documentation that we add to as other hooks are exposed. We just haven't had a need for any other hooks for a while. I am considering adding a new hook to allow customizing what gets included in the autocommit. There's a use case to support committing back auto generated documentation in addition to changelog files.