Add fish wrapper and make it my default shell

wrappers/fish/config.fish

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+# Abbreviations
+abbr --add --global -- flake-update 'nix flake lock --update-input'
+abbr --add --global -- ns 'nix shell'
+abbr --add --global -- nss 'nix search'
+abbr --add --global -- vim hx
+
+# Aliases
+alias cat bat
+alias l 'eza -lah --group-directories-first --icons'

wrappers/fish/default.nix

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+{lib, pkgs, ...}: {
+  # TODO: Fix once https://github.com/viperML/wrapper-manager/issues/14 is resolved
+  wrappers.fish = {
+    basePackage = pkgs.runCommandNoCC "fish-binary" {} ''
+      install -D -m555 ${lib.getExe pkgs.fish} "$out/bin/fish"
+    '';
+
+    prependFlags = [
+      "-C"
+      "source ${./config.fish}"
+    ];
+
+    pathAdd = with pkgs; [bat eza];
+  };
+}