Admonitions don't scale down properly in tables

[eric-schneider]

We generally scale down all elements within a table (e.g. smaller font/symbol size) to mitigate the inherent space constraints. However, admonitions (and their contents) don't appear to follow the same scaling factor, and seem to render just as they do when outside of a table. See the complex table example in the UI preview: https://riptano.github.io/docs-ui/main/asciidoc/tables.html#complex-table-w-asciidoc-content

IMO we should probably scale down at least the content of an admonition when it appears in a table. But perhaps we should scale down other aspects like the label/symbol and the top color bar.