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/inspectMunichEntry.js

@@ -0,0 +1,16 @@
+const Database = require("better-sqlite3");
+const path = require("path");
+const db = new Database(
+  path.join(__dirname, "..", "data", "travel_rates_scraped.sqlite3")
+);
+const row = db
+  .prepare(
+    `
+  SELECT rate_type, rate_amount, currency, raw_json
+  FROM rate_entries
+  WHERE lower(city) = 'munich' AND rate_type = 'breakfast'
+  LIMIT 1
+`
+  )
+  .get();
+console.log(row);