Use site-functions directory for all zsh plugins

zsh/_mkcd

@@ -0,0 +1,10 @@
+#compdef mkcd
+# Make a directory, then change into it
+
+# ========== Shortcuts ==========
+mkcd() {
+    [[ ! -d "${1}" ]] && mkdir --parents -- "${1}"
+    cd "${1}" || exit
+}
+
+autoload -Uz mkcd