Add Phase 5 Caddy deployment config and sync script

- deploy/baflakehouse.caddy: handle_path snippet routes /baflakehouse*
  to docs/ with prefix stripping so pkgdown flat structure maps correctly
- bin/sync-caddy.sh: one-time script to install snippet and zero-downtime
  reload Caddy; deploy.R handles everything after that automatically

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

bin/sync-caddy.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# bin/sync-caddy.sh
+#
+# One-time (or on Caddy config change) script to install the baflakehouse
+# Caddy route snippet and reload Caddy with zero downtime.
+#
+# Run from the project root:
+#   bash bin/sync-caddy.sh
+
+set -euo pipefail
+
+SNIPPET_SRC="$(dirname "$0")/../deploy/baflakehouse.caddy"
+SNIPPET_DST="/docker/caddy/conf.d/baflakehouse.caddy"
+CADDY_CONTAINER="caddy"
+
+echo "→ Copying Caddy snippet to ${SNIPPET_DST}..."
+cp "${SNIPPET_SRC}" "${SNIPPET_DST}"
+
+echo "→ Reloading Caddy (zero downtime)..."
+docker exec "${CADDY_CONTAINER}" caddy reload -c /etc/caddy/Caddyfile
+
+echo "✔ Done. Site live at https://docs.robwiederstein.org/baflakehouse"