Include note about Tailwind per-component errors using '@apply'

[Sergix]

Changes

• Adds information about possible errors using UI component integrations with the @apply directive and custom Tailwind classes. Example error from a Vue component: The 'example-class' class does not exist. If 'example-class' is a custom class, make sure it is defined within a @layer directive.
• Gives a code example of how to fix the errors
• 🐛 BUG: Style Issues when using @apply (TailwindCSS) #2660
• 🐛 BUG: Tailwind custom classes from .vue file does not exist #3073

Testing

• This is a documentation change, so no testing is needed, but the solution the documentation indicates has been tested using Vue in my own environment.
• The example code has also been tested in my own environment.

Docs

Documentation update

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