[css-view-transitions-2] Refactor based on topics (w3c#10098)

* [css-view-transitions-2] Editorial pass

* Update css-view-transitions-2/Overview.bs

Co-authored-by: Khushal Sagar <63884798+khushalsagar@users.noreply.github.com>

* Update css-view-transitions-2/Overview.bs

Co-authored-by: Khushal Sagar <63884798+khushalsagar@users.noreply.github.com>

* Write cross-doc overview, add examples, apply resolutions

* Use CSSOMString for type list

* Use setlike instead of DOMNodeTokenList

* Use Set instead of List

* Move algos & data structure back to own section

* More nits

* Fix link

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Co-authored-by: Khushal Sagar <63884798+khushalsagar@users.noreply.github.com>

Author: noamr