Add function for safe removal of external HDDs

Add zsh function that can be used for safely removing external HDDs
since only unmounting them will not make them stop spinning.

.config/zsh/plugins/functionsPost.zsh

@@ -321,3 +321,12 @@ function urlenc() {
 function urldec() {
 	python3 -c "from urllib import parse; print(parse.unquote('$@'), end='')"
 }
+
+safe-remove() {
+	[ $# -gt 0 ] || return 1
+	[ -e "$1" ] || return 1
+
+	sync
+	udiskctl unmount -b "$1" || return 1
+	udiskctl power-off -b "/dev/$(lsblk -no pkname "$1")"
+}