Tutorial: 2D Triangulations

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Summary of Changes

Add a tutorial for getting started with 2D Triangulations in an easier way than the User Manual.
This could as well become a section in the User Manual.

Link to the html page.

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/build:v0

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The documentation is built. It will be available, after a few minutes, here: https://cgal.github.io/8739/v0/Manual/index.html

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/force-build:v0

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There was an error while building the doc:

/home/runner/work/cgal/cgal/Documentation/doc/Documentation/Tutorials/Tutorial_triangulation_2.txt:89: warning: block marked with [TutoT2-no-auto] for \snippet should appear twice in file Triangulation_2/Tutorial_Triangulation_2.cpp, found it 0 times

https://github.com/CGAL/cgal/actions/runs/13378857405

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/force-build:v0

[github-actions]

The documentation is built. It will be available, after a few minutes, here: https://cgal.github.io/8739/v0/Manual/index.html

[afabri]

/force-build:v0

[github-actions]

The documentation is built. It will be available, after a few minutes, here: https://cgal.github.io/8739/v0/Manual/index.html

[afabri]

/force-build:v0

[github-actions]

The documentation is built. It will be available, after a few minutes, here: https://cgal.github.io/8739/v0/Manual/index.html

[afabri]

/force-build:v0

[github-actions]

The documentation is built. It will be available, after a few minutes, here: https://cgal.github.io/8739/v0/Manual/index.html