Docs: add a technical reference with types

[kaelig]

Is your feature request related to a problem? Please describe
When building addons, adding decorators, or toolbars… I always feel like I need to look at Storybook's source or look for how other people have solved it in their projects.

Describe the solution you'd like
I'd love to have a technical reference that's very thorough and also contains all types available publicly. Something like TypeDoc would be great (it doesn't have to be pretty, just thorough).

Are you able to assist to bring the feature to reality?
I'm happy to review pull requests!

[jonniebigodes]

@kaelig sounds good to me. If you don't mind and add the content of this issue to the pinned that i've setup (#13499) we could go from there. Sounds good? Looking forward to work with you on this.

Stay safe

[kaelig]

Sounds good, thank you!