Validate reference documentation and tutorials

[IngoScholtes]

• Some visualizations in the tutorial do not work
• Check and update code in tutorials
• Validate and complete parameter documentation

[IngoScholtes]

Checked/fixed tutorial units:

• Basic Concepts (basic_concepts.ipynb)
• Temporal Graph Analysis (temporal_graphs.ipynb)
• Interactive Graph Visualization (visualisation.ipynb)
• Temporal Network Visualizations with Manim (manim_tutorial.ipynb)
• Graph Learning in Netzschleuder Data (netzschleuder.ipynb)
• Path Data and Higher-Order Models (paths_higher_order.ipynb)
• Higher-Order Models for Time-Respecting Paths in Temporal Graphs (trp_higher_order.ipynb)
• Causality-Aware Graph Neural Networks (dbgnn.ipynb)
• Generative Models for Random Graphs (generative_models.ipynb)
• Develop Custom Plot Functions (plot_tutorial.ipynb)

[M-Lampert]

The visualisation notebooks (plot_tutorial.ipynb, visualisation.ipynb, manim_tutorial.ipynb) will be updated with #295

[M-Lampert]

I just checked the Temporal Graph Analysis (temporal_graphs.ipynb) notebook in Google Colab. The loading of '../data/ants_1_1.tedges' does not work in Colab since it does not have access to the whole repository. Just the notebook is copied over so it cannot find the file. If we want the notebooks to work in Google Colab, then we should think about replacing the datasets that are available only in the repository with datasets available online (e.g. via Netzschleuder). Related to #129.

[M-Lampert]

Related to this, I just cleaned up the docs/tutorial-directory and combined all of the useful snippets from the notebooks that have been excluded from the documentation to one tutorial notebook that explains the core implementation concepts. See #297