Replace link with contents

I'm pretty sure git won't let me create a pre-push hook this way

pre-push-hook

@@ -1 +0,0 @@
-.git/hooks/pre-push

pre-push-hook

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+set -e
+
+remote="$1"
+url="$2"
+
+z40=0000000000000000000000000000000000000000
+
+while read local_ref local_sha remote_ref remote_sha
+do
+  if [[ "${local_sha}" = $z40 ]]; then
+    echo "Deleting stuff, nothing to do"
+  else
+    (
+       cd cours
+       poetry run python build.py --clean --werror
+       poetry run python build.py --format pdf
+       poetry run python deploy.py
+    )
+  fi
+done
+
+git lfs pre-push "$@"