Document all tags and named sub-components

Closes #9

container.go

@@ -10,9 +10,14 @@ var _ tomo.ContentObject = new(Container)
 // primitive for building more complex layouts. It has two main variants: an
 // outer container, and an inner container. The outer container has padding
 // around its edges, whereas the inner container does not. It also has a
-// "sunken" variation designed to hold a scrolled list of items. The container
-// will have a corresponding object role variation of either "outer", "inner",
-// or "sunken".
+// "sunken" variation designed to hold a scrolled list of items.
+//
+// Tags:
+//   - [outer] The container is the root of a window.
+//   - [inner] The container is within another container, and is part of a
+//     larger layout.
+//   - [sunken] The container holds a visually grouped, usually scrolled, list
+//     of items.
 type Container struct {
 	box tomo.ContainerBox
 }