theme: Autoformat layouts and assets

[bep]

• theme: Format layouts
• theme: Format assets

[bep]

I have tried to be careful and manually inspected the diff, I think this should be safe/good. It would be good going forward if we could not have to worry too much about formatting.

[jmooring]

My only comment is about... the comment. Can we do this:

{{- /* prettier-ignore-end */}}

Instead of this?

{{/* prettier-ignore-end */ -}}

My preference is to see white space removal syntax at the beginning of a line (and only at the end if necessary), but that's just me.

Otherwise this looks fine.

[bep]

Instead of this?

I tried that, but that doesn't work with Prettier (it ERRORs).