[Feature request] Use 'shadow' border

[Bekaboo]

Firstly, thank you for making this awesome plugin!

The plugin works pretty good with little configuration, and this is a only request of aesthetic concern. I notice that when I use 'shadow' as the border style, the floating window looks weird:

It seems that there are actually two floating windows side by side, resulting in the gap in the middle. Can we make it more coherent? Thanks in advance!

[SmiteshP]

Hi @Bekaboo !
I tried working out this issue. Not able to figure out why the gap in middle appears. Also nui.nvim only allows setting border_chars, and only using that its not possible to have the "floating" effect in bottom_left and top_right corners. Will need some manual highlighting in those corners I guess. Maybe this could be resolved as part of this issue . Will remove mentions of shadow style in docs until then.