Cleanup kitty themes (#91)

Makes them suitable for inclusion in
https://github.com/kovidgoyal/kitty-themes

lua/tokyonight/extra/init.lua

@@ -19,15 +19,23 @@ local extras = {
 	xresources = "Xresources",
 	xfceterm = "theme",
 }
-local styles = { "storm", "night", "day" }
+-- map of style to style name
+local styles = { 
+    storm = " Storm",
+    night = "",
+    day = " Day", 
+}
 
 for extra, ext in pairs(extras) do
 	local plugin = require("tokyonight.extra." .. extra)
-	for _, style in pairs(styles) do
+	for style, style_name in pairs(styles) do
 		config.style = style
 		config = config or require("tokyonight.config")
 		config.transform_colors = true
 		local colors = require("tokyonight.colors").setup(config)
-		write(plugin.generate(colors), extra .. "_tokyonight_" .. style .. "." .. ext)
+        local fname = extra .. "_tokyonight_" .. style .. "." .. ext
+        colors["_upstream_url"] = "https://github.com/folke/tokyonight.nvim/raw/main/extras/" .. fname
+        colors["_style_name"] = "Tokyo Night" .. style_name
+		write(plugin.generate(colors), fname)
 	end
 end