Admonitions scss styling is no longer working properly

[viniciusdc]

          @viniciusdc The [styling that was previously working for the admonitions](https://github.com/nebari-dev/nebari-docs/blob/main/docs/src/theme/components/admonitions.scss) is no longer being used. All of the admonitions now are using the css rules that start with `alert` (e.g. even for note). So the current rules are not applied. 

There is also a comment in admonitions.scss about alerts. I played with this a bit, but the behavior seems to have changed and/or I dont have the skillz needed to sort it out.

So at this point, everything in admonitions.scss is being ignored and we are just getting the default admonition styling. I'm not sure if there is anyone available to spend the time to sort this out right now.

Originally posted by @kcpevey in #503 (comment)