Revisit pages that use the terms "section{,s}" or "card{,s}"

[nexushoratio]

A lot of pages use the term "section" to refer to a primary Scroller. That name was originally chosen because the first one implemented used the HTML element section. But, it can be a bit confusing when another Scroller, either primary or secondary, on the same Page, is also selected by the element section. And similar can be used for "card", where we use the word to describe how the information is being displayed, not what it contains.

For Events, we are starting off with the phrase "event collection".

Explorer this and other options for the various pages. What can we do to improve consistency?