feat: add blog deploy script

Automate publishing the Hugo blog to the nginx host on Tower: build
with hugo --minify, rsync the public/ output to bus-blog, then smoke
test the public HTTPS URL to confirm the route is live end-to-end.

blog/deploy.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Publish the blog to Tower (nginx :8090 -> https://bus.saillant.cc)
+set -euo pipefail
+cd "$(dirname "$0")"
+
+TOWER="clems@192.168.0.120"
+DEST="/home/clems/bus-blog/public/"
+
+echo "==> hugo build"
+hugo --minify --cleanDestinationDir
+
+echo "==> rsync to $TOWER:$DEST"
+rsync -az --delete public/ "$TOWER:$DEST"
+
+echo "==> smoke test"
+curl -sfI https://bus.saillant.cc/ >/dev/null \
+  && echo "OK: https://bus.saillant.cc" \
+  || { echo "WARN: public URL not reachable (DNS/route?)"; exit 1; }