style_bootstrap refactor

[vincentarelbundock]

Typst:

# No headers
k <- x
colnames(k) <- NULL
k <- tt(k)
k |> style_tt(i = 2, j = 2:3, line = "b", line_color = "green")

[vincentarelbundock]

FYI, @J-Moravec This is a proof of concept work in progress. Doesn't support line styling or custom bootstrap classes, but it seems to solve our problem.