some salt according to: https://git.imp.fu-berlin.de/swp-ws21-fahrtenbuch/team-einhorn/fahrtenbuch/-/merge_requests/7#note_79858

Fix for `Parameter 'res' implicitly has an 'any' type.` using QueryResult.  Quick (temporary) Fix for missing "pg"-module.

Point (3) Leander-Comment: 1)config gathers env-vars. 2)seqConnection connect to db. 3)db_init initilizes tables

- Split server and client into two separate packages.
- Update README with info on how to start dev server locally
- Client
	- Update react-router-dom to v6
	- Separate page components from UI components
	- Add "proxy" field to package.json for proxying api requests to the backend server
- Server
	- Update path of static file serving to new client directory
	- Update scripts