Cleanup kitty themes (#91)

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

lua/tokyonight/extra/kitty.lua

@@ -6,45 +6,51 @@ local M = {}
 function M.generate(colors)
   local kitty = util.template(
     [[
-  # TokyoNight colors for Kitty
-  
-  background ${bg}
-  foreground ${fg}
-  selection_background ${bg_visual}
-  selection_foreground ${fg}
-  url_color ${green1}
-  cursor ${fg}
-  
-  # Tabs
-  active_tab_background ${blue}
-  active_tab_foreground ${bg_dark}
-  inactive_tab_background ${bg_highlight}
-  inactive_tab_foreground ${dark3}
-  #tab_bar_background ${black}
-  
-  # normal
-  color0 ${black}
-  color1 ${red}
-  color2 ${green}
-  color3 ${yellow}
-  color4 ${blue}
-  color5 ${magenta}
-  color6 ${cyan}
-  color7 ${fg_dark}
-  
-  # bright
-  color8 ${terminal_black}
-  color9 ${red}
-  color10 ${green}
-  color11 ${yellow}
-  color12 ${blue}
-  color13 ${magenta}
-  color14 ${cyan}
-  color15 ${fg}
-  
-  # extended colors
-  color16 ${orange}
-  color17 ${red1}
+# vim:ft=kitty
+
+## name: ${_style_name}
+## license: MIT
+## author: Folke Lemaitre
+## upstream: ${_upstream_url}
+
+
+background ${bg}
+foreground ${fg}
+selection_background ${bg_visual}
+selection_foreground ${fg}
+url_color ${green1}
+cursor ${fg}
+
+# Tabs
+active_tab_background ${blue}
+active_tab_foreground ${bg_dark}
+inactive_tab_background ${bg_highlight}
+inactive_tab_foreground ${dark3}
+#tab_bar_background ${black}
+
+# normal
+color0 ${black}
+color1 ${red}
+color2 ${green}
+color3 ${yellow}
+color4 ${blue}
+color5 ${magenta}
+color6 ${cyan}
+color7 ${fg_dark}
+
+# bright
+color8 ${terminal_black}
+color9 ${red}
+color10 ${green}
+color11 ${yellow}
+color12 ${blue}
+color13 ${magenta}
+color14 ${cyan}
+color15 ${fg}
+
+# extended colors
+color16 ${orange}
+color17 ${red1}
   ]],
     colors
   )