* Restructure and optimize `CheckboxWidget` docs
* Minor improvements
* Use new tab macros and some reformatting
* Fix bug in widget-attr-link tooltip
* Minor layout tweaks
* First try at a Widget Documentation Style Guide
* Add new tabs-related macros to overview
* Update CSS, add tm-scroll and rename macros
* Avoid RSoE with tm-scroll, improve CSS for tab-links
* Handle doc-tab-links within tab tiddlers better
* Reflect macro name changes in their docs
* Update Widget Doc Style Guide
