* Instantiate/initialize all non-autoplaying carousels in docs pages

* Rewrite/reorganise carousel docs page

* start with static/non-autoplaying examples
* explicitly mention that carousels currently need to be manually initialized
* split out and explain autoplaying and the weird "autoplay after first interaction" behaviour, as well as the pause on hover/focus

* Add callout about autoplaying and accessibility

* Don't have the dark variant example autoplay

* Add "autoplaying" to cspell custom dictionary

* Tweal wording, move Page Visibility API to autoplay section

* Tweak explanation for methods, add line break in js code for consistency with last code block on the page

* Tweak method descriptions

* Tweak headings (plural "carousels")

* Move some paragraphs out of intro and into basic example, reword the nested and accessibility paragraph

* Tweak warning about `.active` slide

* Tweak callout wording

* Further pro...