feat: add randombones variants for when light / dark themes are set (#219)

* adding random options specific to set backgrounds

skeleton

checking about name

checking approach

setting to dark

light parity

* changed so colorscheme = randombones and randombones_colors_name = randomly chosen theme

* let colorscheme have _dark / _light prefix

colors/randombones_dark.lua

@@ -0,0 +1,24 @@
+if vim.g.colors_name then
+	vim.api.nvim_command [[highlight clear]]
+end
+
+vim.g.colors_name = "randombones_dark"
+
+local util = require "zenbones.util"
+local colorschemes = util.get_colorscheme_list()
+
+math.randomseed(os.time())
+
+local colorscheme = colorschemes[1]
+while true do
+	local index = math.random(#colorschemes)
+	colorscheme = colorschemes[index]
+	if colorscheme.background ~= "light" then
+		break
+	end
+end
+
+vim.g.randombones_colors_name = colorscheme.name
+vim.o.background = "dark"
+
+util.apply_colorscheme()