JV Finally Get Embed Options and Plugins Right

This has been on @MaxPower15's list for a while, and thanks to help from him and @bschwartz, I think I'm getting closer on these Embed Options and Plugins docs.

This PR:

* re-organizes the doc article
* simplifies the copy
* brings in updated params
* Updates styling (close up a little bit of white space)
* removes unused **params** solo docs

:hatching_chick: gimme some thoughts!