fix(alacritty): update alacritty theme to use the new terminal colors (#656)

## Description

Refs: #648

Author: Juhan280

lua/tokyonight/extra/alacritty.lua

@@ -6,7 +6,12 @@ local M = {}
 function M.generate(colors)
   local alacritty = util.template(
     [=[
+# -----------------------------------------------------------------------------
 # TokyoNight Alacritty Colors
+# Theme: ${_style_name}
+# Upstream: ${_upstream_url}
+# -----------------------------------------------------------------------------
+
 # Default colors
 [colors.primary]
 background = '${bg}'
@@ -18,25 +23,25 @@ foreground = '${fg}'
 
 # Normal colors
 [colors.normal]
-black = '${black}'
-red = '${red}'
-green = '${green}'
-yellow = '${yellow}'
-blue = '${blue}'
-magenta = '${magenta}'
-cyan = '${cyan}'
-white = '${fg_dark}'
+black = '${terminal.black}'
+red = '${terminal.red}'
+green = '${terminal.green}'
+yellow = '${terminal.yellow}'
+blue = '${terminal.blue}'
+magenta = '${terminal.magenta}'
+cyan = '${terminal.cyan}'
+white = '${terminal.white}'
 
 # Bright colors
 [colors.bright]
-black = '${terminal_black}'
-red = '${red}'
-green = '${green}'
-yellow = '${yellow}'
-blue = '${blue}'
-magenta = '${magenta}'
-cyan = '${cyan}'
-white = '${fg}'
+black = '${terminal.black_bright}'
+red = '${terminal.red_bright}'
+green = '${terminal.green_bright}'
+yellow = '${terminal.yellow_bright}'
+blue = '${terminal.blue_bright}'
+magenta = '${terminal.magenta_bright}'
+cyan = '${terminal.cyan_bright}'
+white = '${terminal.white_bright}'
 
 # Indexed Colors
 [[colors.indexed_colors]]