refactor!: restructure and document configuration

shared/home-manager/dotfiles/fish/Catppuccin-Frappe.theme

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+# name: 'Catppuccin frappe'
+# url: 'https://github.com/catppuccin/fish'
+# preferred_background: 303446
+
+fish_color_normal c6d0f5
+fish_color_command 8caaee
+fish_color_param eebebe
+fish_color_keyword e78284
+fish_color_quote a6d189
+fish_color_redirection f4b8e4
+fish_color_end ef9f76
+fish_color_comment 838ba7
+fish_color_error e78284
+fish_color_gray 737994
+fish_color_selection --background=414559
+fish_color_search_match --background=414559
+fish_color_option a6d189
+fish_color_operator f4b8e4
+fish_color_escape ea999c
+fish_color_autosuggestion 737994
+fish_color_cancel e78284
+fish_color_cwd e5c890
+fish_color_user 81c8be
+fish_color_host 8caaee
+fish_color_host_remote a6d189
+fish_color_status e78284
+fish_pager_color_progress 737994
+fish_pager_color_prefix f4b8e4
+fish_pager_color_completion c6d0f5
+fish_pager_color_description 737994

shared/home-manager/dotfiles/fish/default.nix

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+{ ... }:
+
+{
+  home.file = {
+    # Cattpuccin theme for fish shell.
+    ".config/fish/themes/Catppuccin-Frappe.theme".source = ./Catppuccin-Frappe.theme;
+  };
+
+  programs.fish = {
+    enable = true;
+
+    interactiveShellInit = ''
+      ## Set vim mode
+      set -g fish_key_bindings fish_vi_key_bindings
+
+      # Configure FZF
+      set -x FZF_DEFAULT_OPTS '--color=fg:#f8f8f2,hl:#bd93f9 --color=fg+:#f8f8f2,bg+:#44475a,hl+:#bd93f9 --color=info:#ffb86c,prompt:#50fa7b,pointer:#ff79c6 --color=marker:#ff79c6,spinner:#ffb86c,header:#6272a4 --layout=reverse --height 50%'
+
+      # Remove welcome message
+      set -x fish_greeting ""
+
+      ## Add directories to $PATH
+      fish_add_path /home/wizardlink/.local/share/scripts \
+          /home/wizardlink/.config/emacs/bin \
+          /home/wizardlink/.nimble/bin \
+          /home/wizardlink/.cargo/bin \
+          /home/wizardlink/.local/bin \
+          /lib/flatpak/exports/bin
+
+      zoxide init --cmd cd fish | source
+    '';
+
+    shellAbbrs = {
+      z = "zoxide";
+      pkg_expr = {
+        position = "anywhere";
+        expansion = "--expr 'with import <nixpkgs> { % }; '";
+      };
+      impure_cmd = {
+        position = "command";
+        expansion = "NIXPKGS_ALLOW_UNFREE=1 nix % --impure";
+      };
+    };
+
+    shellAliases = {
+      del = "trash_file";
+      dev = "nix develop -c fish";
+      doom = "~/.config/emacs/bin/doom";
+      repl = "NIXPKGS_ALLOW_UNFREE=1 nix repl --impure --extra-experimental-features 'flakes' nixpkgs#legacyPackages.x86_64-linux";
+    };
+
+    functions = {
+      fish_prompt.body = ''
+        set_color CC241D
+        echo '&' (set_color normal)
+      '';
+
+      fzf_edit.body = ''
+        fzf --multi --bind 'enter:become(nvim {+})'
+      '';
+
+      trash_file.body = ''
+        mv $argv ~/.local/share/Trash
+      '';
+
+      ya.body = ''
+        set tmp (mktemp -t "yazi-cwd.XXXXX")
+        yazi $argv --cwd-file="$tmp"
+        if set cwd (cat -- "$tmp"); and [ -n "$cwd" ]; and [ "$cwd" != "$PWD" ]
+          cd -- "$cwd"
+        end
+        rm -f -- "$tmp"
+      '';
+    };
+  };
+}