Implement semantic theme color system

themes/nord/colors.toml

@@ -1,3 +1,5 @@
+mode = "dark"
+
 accent = "#81a1c1"
 cursor = "#d8dee9"
 foreground = "#d8dee9"
@@ -5,19 +7,28 @@ background = "#2e3440"
 selection_foreground = "#d8dee9"
 selection_background = "#4c566a"
 
-color0 = "#3b4252"
-color1 = "#bf616a"
-color2 = "#a3be8c"
-color3 = "#ebcb8b"
-color4 = "#81a1c1"
-color5 = "#b48ead"
-color6 = "#88c0d0"
-color7 = "#e5e9f0"
-color8 = "#4c566a"
-color9 = "#bf616a"
-color10 = "#a3be8c"
-color11 = "#ebcb8b"
-color12 = "#81a1c1"
-color13 = "#b48ead"
-color14 = "#8fbcbb"
-color15 = "#eceff4"
+bg = "#2e3440"
+lighter_bg = "#3b4252"
+selection = "#434c5e"
+muted = "#4c566a"
+dark_fg = "#667080"
+fg = "#8690a0"
+light_fg = "#adb5c4"
+bright_fg = "#d8dee9"
+
+red = "#bf616a"
+yellow = "#ebcb8b"
+orange = "#d5967a"
+green = "#a3be8c"
+cyan = "#88c0d0"
+blue = "#81a1c1"
+purple = "#b48ead"
+brown = "#6a4b3d"
+dark_bg = "#222730"
+darker_bg = "#191c23"
+bright_red = "#bf616a"
+bright_yellow = "#ebcb8b"
+bright_green = "#a3be8c"
+bright_cyan = "#8fbcbb"
+bright_blue = "#81a1c1"
+bright_purple = "#b48ead"