WIP events/React docs

[LarryUllman]

Starts editing the event/React docs for clarity and consistency. Still need to do the "Use automations for dynamic responses" page.

Checklist

• This pull request includes a label categorizing the change e.g. maintenance, fix, feature, enhancement, docs.

For documentation changes:

• This pull request includes redirect settings in mint.json for files that are removed or renamed.

[billpalombi]

I think the intro, definition, and use case sections can be consolidated and pared down a bit. If we remove the image, we can get most of the text above the fold.

[discdiver]

LGTM. Merged @billpalombi's suggestions b/c I know you're OOO, @LarryUllman .