Issue #158 Add Optional Keyboard Commands to Accordion Example #397
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Added the following (optional) keyboard commands based on issue #158:
Up/ Down: Cycle focus through accordion toggle controls/ headings
Home/ End: Focus first/ last accordion toggle control/ heading
Control + Page Up/ Down: Move focus from accordion panel to accordion heading, and then cycle through headings.
Also refactored JS and CSS to be simpler to understand.