Add instructions for compatibility with Turbo morphing

[northeastprince]

No description provided.

[josefarias]

Hey @northeastprince, @jorgemanrubia helpfully pointed out internally that my worries about adding too many observers in #152 (review) might not be an issue. Stimulus adds observers all the time after all and it hasn't been a problem. So we might go back to that approach.

I'll make some measurements soon and make the call. You're welcome to try and find the best place to create those observers (ideally one per element, to avoid complexity). I might also be working on this soon, so if I happen to get to this first you can be sure I'll add you as co-author. Thanks!

[josefarias]

At this point it seems we're going to go with #156, although it still needs some work. I've added you as co-author in that PR.

Closing this for now in favor of that PR.