chore(easier-setup): Easier start for new developers

[JumpLink]

To make it easier for the new developer to get started, I have continued to work on the developer experience:

• Easy startup, where everything needed to start can be done in the root directory.
• The docker-compose.yml and the corresponding .env are now in the root directory.
• vite and tsc no longer clear the screen in watch mode, which previously caused important information to be lost in the console.
• To be able to disable the clearScreen option I also updated vite and the plugins used.
• README.md updated for an easy start.
• Added information to the backend`s README.md on how to make a test purchase with a test credit card.
• I have also added a few new scripts to the package.json, for example presetup which should be executed before the first start of the container stack and setup which should be executed when the container stack is running.

[wpf500]

This is great. As a next step (in a separate PR), how about resolving #1 and moving the router into this repo? Then the docker-compose file can have it as a service and we can delete all the proxy config from the frontend.

[JumpLink]

Yea, would like to do this 👍