Create hooks.md

Author: MichaelCurrin

recipes/jekyll/hooks.md

@@ -0,0 +1,19 @@
+# Hooks
+
+- `Makefile`
+    ```mk
+    .PHONY: hooks
+    hooks:
+      # Don't use -r flag as it is not widely compatible.
+      cd .git/hooks && ln -s -f ../../hooks/pre-push pre-push
+      ls -l ./.git/hooks/pre-push
+    ```
+- `hooks/pre-push`
+    ```sh
+    #!/bin/sh -e
+
+    git pull --rebase
+
+    # Prevent push on failed Jekyll build.
+    make build
+    ```