Add Doc to rename the cloud DB

doc/RenameDatabase.md

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+# Rename Database
+
+## Start
+
+1. Scale down cloud deployment
+`k -n nextcloud scale deployment cloud-deployment --replicas 0`
+
+## Change db-name in postgres
+
+1. Connect to postgres-pod
+`k -n nextcloud exec -it postgresql-... -- bash`
+2. Connect to a database
+`PGPASSWORD=$POSTGRES_PASSWORD psql -h postgresql-service -U $POSTGRES_USER postgres`
+3. List available databases
+`\l`
+4. Rename database
+`ALTER DATABASE cloud RENAME TO nextcloud;`
+5. Verify
+`\l`
+6. Quit
+`\q`
+
+## Update postgres-config
+
+1. Edit configmap
+`k -n nextcloud edit configmap postgres-config`
+2. Update postgres-db value
+3. Save
+
+## Update nextcloud db-name
+
+1. Scale up nextcloud
+`k -n nextcloud scale deployment cloud-deployment --replicas 1`
+2. Connect
+`k -n nextcloud exec -it cloud-deployment-... -- bash`
+3. Update db value in config.php
+`apt update`
+`apt install vim`
+`vim config/config.php`
+4. Update dbname field
+5. Verify server+website is working