Adds post-update hook to repo, since it lives in .git, making it invisible.

diff --git a/git-hooks/post-update b/git-hooks/post-update
new file mode 100755 (executable)
index 0000000..8505dfd
--- /dev/null
+++ b/git-hooks/post-update
@@ -0,0 +1,9 @@
+#!/bin/bash
+#
+# Updates and rebuilds the wiki.
+
+echo "Updating wiki..."
+echo
+sudo -u tanks /bin/bash -l -c 'cd /home/tanks/wiki && git pull && markdoc build'
+echo
+echo "Wiki rebuilt!"