Change domain to de.coronastatus.eu

Unfortunately coronastatus.de is already taken. As a bonus, the pattern
{country}.coronastatus.eu gives us a fall-back for all european
countries where the domain is not available.

Author: trkoch

app/countrySpecific/de/config.ts

@@ -1,7 +1,7 @@
 import { Config } from '../../domain/types';
 
 export const countrySpecificConfig: Config = {
-  BASE_URL: 'coronastatus.de',
+  BASE_URL: 'de.coronastatus.eu',
   COUNTRY_CODE: 'de',
   DB_PATH: './covid_db',
   LOCALE: 'de-DE',