Add class and style to other components

[ghaetinger]

I'm adding the style parameter to grid alongside the class parameter to grid, vbox and hbox.

I have also moved the notebook editing Pkg activation to be hidden on top and use Base.current_project rather than a relative path.

[github-actions[bot]]

Try this Pull Request!

Open Julia and type:

  julia> import Pkg
julia> Pkg.activate(temp=true)
julia> Pkg.add(url="https://github.com/JuliaPluto/PlutoUI.jl", rev="add-class-and-style-to-grid-hbox-vbox")
julia> using PlutoUI

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