prose: split scrollbox-tabbar.org prose into per-module org files

Distribute the literate prose from the old combined scrollbox-tabbar.org
into three individual module org files:

- scrollbox.org: ScrollBox class, render, scrollbars, bug fixes,
  plus the combined test suite (tangles scrollbox-tabbar-tests.lisp)
- tabbar.org: TabBar class, navigation, keyboard handler, render
- container-package.org: Package definition and exports

The old scrollbox-tabbar.org is retained as a documentation archive
with all code blocks set to :tangle no and a redirecting note.

Fixes the draw-scrollbars code block to use the post-bugfix version
(with layout-node origin offset ox/oy), matching the working code.
All 13 test suites pass at 100%.

org/container-package.org

@@ -8,19 +8,26 @@ The ~cl-tty.container~ package defines the container component types:
 ScrollBox and TabBar. It uses ~cl-tty.backend~, ~cl-tty.box~,
 ~cl-tty.layout~, and ~cl-tty.input~.
 
-* Implementation
+The package exports both ScrollBox and TabBar classes, constructors,
+accessors, and navigation functions.
+
+* Package Definition
 
 #+BEGIN_SRC lisp :tangle ../src/components/container-package.lisp
 (defpackage :cl-tty.container
   (:use :cl :cl-tty.backend :cl-tty.box :cl-tty.layout :cl-tty.input)
   (:export
+   ;; ScrollBox
    #:scroll-box #:make-scroll-box
    #:scroll-box-scroll-y #:scroll-box-scroll-x
-   #:scroll-box-children #:scroll-by
-   #:sticky-scroll-p
+   #:scroll-box-children
+   #:scroll-by #:sticky-scroll-p
    #:clamp-scroll
+   ;; TabBar
    #:tab-bar #:make-tab-bar
    #:tab-bar-active #:tab-bar-tabs
    #:tab-bar-add #:tab-bar-next #:tab-bar-prev
-   #:tab-bar-select #:tab-bar-handle-key))
+   #:tab-bar-select #:tab-bar-handle-key
+   ;; Rendering
+   #:render))
 #+END_SRC