fish: Add paru to abbreviations

Now it's possible to type "p" for paru instead of having to type
"pacman" or "sudo pacman". This is mostly for convenience, since I think
there's still some merit to typing things out the standard way.

fish/.config/fish/config.fish

@@ -82,6 +82,7 @@ if not set -q set_abbr
     abbr e      "exit"
     abbr k      "kitty @ set-colors -c -a ~/.cache/wal/kitty"
     abbr l      "ls -l"
+    abbr p      "paru"
     abbr w      "wal -o ~/.config/wal/done.sh"
     abbr T      "tree"