Improve git hook to remove invalid links

In case a file is moved to another location this change will most likely
end in a dangling link in the home-dir. This change fixes this by
removing links automatically which are off because the target-file has
been moved to another location.

README.adoc

@@ -46,7 +46,7 @@ That will remove the links pre-commit.
 cat <<EOF > .git/hooks/pre-commit
 #!/usr/bin/env bash
 set -e
-git status --short | grep -E '^D' | sed s/...// | while read f
+git status --short | grep -E '^D|^R' | sed 's/...//;s/ -> .*//' | while read f
 do
   test -L "\$HOME/\$f" && rm "\$HOME/\$f"
 done