css-inline requirement breaks shinylive

[astrowonk]

Prework

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Description

great_tables 0.15 introduces a dependency on css_inline via #557. This is not a pure python library and so breaks compatibility with shinylive.

Reproducible example

Shiny Live failing with GT 0.15

Shiny Live working with GT 0.14

Expected result

Shiny live should not crash when installing great_tables

Additional context

One solution is to remove the css_inline depenccy, make it optional, and put a try/except on the import along with some logic to catch if it's unavailable.

Another would be to see if it could be compiled and built for pyodide?