Improve the MVD tutorial: Textual and programmatic fixes/additions

[JohannesLipp]

What this PR changes/adds

1. This PR modifies text passages and code snippets in the README.md.
2. It also adds <shortenClasspath name="ARGS_FILE" /> to all six run configurations.

Why it does that

1. README: Improve readability and flow, fix possible errors.
2. Run configurations: Avoid "Command line is too long" error (esp. on Windows).

[paullatzelsperger]

@JohannesLipp please do NOT open unsolicited PRs without first opening an issue/discussion. We have extensive contribution guidelines about that.
No matter how good or useful your PR might appear, there can always be aspects or historic reasons that you might not think of.

For example:

• your PR title violates our rules (conventional commits)
• Windows is not a supported platform, nor is PowerShell. That is on purpose.

While you might think "why? I've only made it better by contributing!", the reality is that once we even so much as mention Windows/PS in the docs, people start to have a certain expectations, and we as the maintainers are stuck with supporting that. And we do not want that.

Subtracting any Windows-related aspects, this PR does not add any value IMO, so I think it should be closed.

[JohannesLipp]

Understood, thanks for the info! Closing this PR now.