feat: add scripts for database inspection and migration

- Implemented multiple scripts to check and inspect meal plans, scraped data, and accommodations for Munich and Riga.
- Added a migration script to convert scraped data into the application's database format.
- Introduced new database service methods for querying and updating travel rates.
- Enhanced server configuration for serving static files in production.
- Updated PostCSS configuration for consistency.

scripts/checkMealPlan.js

@@ -0,0 +1,12 @@
+const Database = require("better-sqlite3");
+const path = require("path");
+const db = new Database(
+  path.join(__dirname, "..", "database", "travel_rates.db")
+);
+console.log(
+  db
+    .prepare(
+      "select city_name, meal_plan_type from travel_rates where lower(city_name)='munich'"
+    )
+    .get()
+);