wip: fish: Create personal port of Nord color theme

An official Nord port for the fish shell doesn't exist (i.e.,
nordtheme/nord#102), and the fish shell's
built-in Nord theme doesn't adhere to the color palette recommendations.
I'll use this until the official port exists to move over to.

fish/.config/fish/conf.d/nordtheme.fish

@@ -0,0 +1,50 @@
+set -l nord0 2e3440
+set -l nord1 3b4252
+set -l nord2 434c5e
+set -l nord3 4c566a
+set -l nord4 d8dee9
+set -l nord5 e5e9f0
+set -l nord6 eceff4
+set -l nord7 8fbcbb
+set -l nord8 88c0d0
+set -l nord9 81a1c1
+set -l nord10 5e81ac
+set -l nord11 bf616a
+set -l nord12 d08770
+set -l nord13 ebcb8b
+set -l nord14 a3be8c
+set -l nord15 b48ead
+
+#XXX: Keep fish_color_param and fish_color_operator the same to ensure typing
+#     paths like ~/… looking consistent between ~ and /….
+
+#XXX: Keep fish_color_keyword, fish_color_end, and fish_color_cwd the same
+#     because keywords/end tokens aren't common in normal interactive shell
+#     typing and keeps the CWD in the prompt prominent with what would most
+#     likely be typed (i.e., command, options, and parameters).
+
+set -g fish_color_normal normal
+set -g fish_color_command $nord8
+set -g fish_color_keyword $nord9
+set -g fish_color_quote $nord14
+set -g fish_color_redirection $nord15 --bold
+set -g fish_color_end $nord9
+set -g fish_color_error $nord11
+set -g fish_color_param $nord10
+set -g fish_color_valid_path --underline
+set -g fish_color_option $nord7
+set -g fish_color_comment $nord3 --italics
+set -g fish_color_selection $nord4 --bold --background=$nord2
+set -g fish_color_operator $nord10
+set -g fish_color_escape $nord13
+set -g fish_color_autosuggestion $nord3
+set -g fish_color_cwd $nord9
+set -g fish_color_cwd_root $nord11
+set -g fish_color_user $nord14
+set -g fish_color_host $nord14
+set -g fish_color_host_remote $nord13
+set -g fish_color_status $nord11
+set -g fish_color_cancel --reverse
+set -g fish_color_search_match --bold --background=$nord2
+
+set -g fish_color_history_current --bold