Standardize hooks, add better key.txt bootstrapper, add update hook to detect --init

home/hooks/.update_pre.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+# chezmoi update --init does not invoke the 'hooks.init.pre' hook, so we do it ourselves
+if grep -q 'init' <<<$CHEZMOI_ARGS; then
+    # CHEZMOI_UPDATE is just a hint in case we need to know if we're updating
+    CHEZMOI_UPDATE=1 $(dirname $0)/.init_pre.sh
+fi