Exportable visualizations

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When building reports on plagiarism, the visualizations Dolos offers can be helpful to prove a case. While making a visualization of certain visualizations currently works, we could also look into offering a more "print-friendly" visualization with the following properties:

• Text labels with student names near nodes (plagiarism graph, timeline) - this is currently shown as tooltip or when clicked only
• Additional information (exact timestamps, similarity%, ...)
• Export as SVG, or render as a larger PNG if this is not easily achievable