fish: functions: Add a helper to bring up or tear down VPN

fish/.config/fish/functions/vpn.fish

@@ -0,0 +1,8 @@
+function vpn
+    set -l var (ls /sys/class/net | grep vpn)
+    if test -z "$var"
+        wg-quick up vpn
+    else
+        wg-quick down vpn
+    end
+end