* Add initial (rough) help panel.
Only includes "products" task items.
* Add help links for other tasks.
* Add header to help tab content.
* Toggle activity panel tabs when performing a setup task.
* Move query string parsing up a level.
* Pass query string as prop to ActivityPanel.
Fixes rerendering issue when entering a task.
* Pass current task to Help panel.
* Filter payments task help items by available payment methods.
* Filter shipping and tax help items based on WCS install.
* Add generic docs link to all help panels.
* Track help panel open.
* Track help panel link clicks.
* Show WCS help items when prompted to install.
* Tasks are only performed on the main route.
E.g. no value for "path".
* Small tweaks to make AcivityPanel more easily testable.
* Add initial tests for ActivityPanel tab logic.
* Modify HelpPanel component for easier testing.
* Add tests for conditional help panel links.
* Fix tracking keyboard "clicks" on help links.
* Fix query prop on embedded pages.
* Allow filtering of help tab items.
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