Use config schema published on dodona.be

[chvp]

The schema here actually contains errors (no intermediate names property under description. Since we will be hosting a schema on dodona.be anyway, just refer to that.

Depends on https://github.com/dodona-edu/dodona/pull/7693

[Copilot]

Pull request overview

This PR updates the VS Code extension’s JSON schema validation to rely on the canonical config schema hosted on dodona.be, removing the bundled local schema that had known errors.

Changes:

• Removed the outdated/broken local config.schema.json.
• Updated package.json JSON validation to use https://dodona.be/schemas/config.json.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
schemas/config.schema.json	Removes the previously bundled schema that contained inaccuracies.
package.json	Points VS Code JSON validation for config.json / dirconfig.json to the hosted schema on dodona.be.

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