Refactor type~{name} document structure and finding system

[BigBlueHat]

Currently this thing's pretty tangled... 🍝

The doc.name === the type~{name} value. When really, doc.name should be the display name...or at least there should be a "pretty" display name stored somewhere.

Things to fix/refactor:

• _view/by_type
• _view/type_definitions
• _list/types_list (...which is currently busted and unused...)
• src/menu-content/*
• type loading in main.js (which uses _view/type_definitions to load component.js files.

Somewhat related to #18 as getting this right means meaningful content shared "everywhere." Doing it wrong will be...less good... 😩