feat(deploy): add vocab course change detection and sync step

- Implemented a new workflow step to detect changes in vocab course files and conditionally sync content.
- Added a script to check for specific changes in the repository and trigger the sync process if necessary.
- Introduced a new npm script for syncing vocab course content in the backend package.json.

backend/package.json

@@ -14,6 +14,7 @@
     "cleanup-connections": "node cleanup-connections.js",
     "diag:town-worth": "QUIET_ENV_LOGS=1 DOTENV_CONFIG_QUIET=1 node scripts/falukant-town-product-worth-stats.mjs",
     "diag:moneyflow": "QUIET_ENV_LOGS=1 DOTENV_CONFIG_QUIET=1 node scripts/falukant-moneyflow-report.mjs",
+    "sync:vocab-courses": "node scripts/sync-vocab-course-content.js",
     "lockfile:sync": "npm install --package-lock-only",
     "test": "echo \"Error: no test specified\" && exit 1"
   },