moved tutorials into new docs tree. Adapted documentation CI task.

.gitlab-ci.yml

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docs/source/conf.py

docs/source/index.rst

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docs/source/tutorials/01_tutorial_getting_started.ipynb

docs/source/tutorials/02_tutorial_basic_kernels.ipynb

docs/source/tutorials/03_tutorial_datahandling.ipynb

docs/source/tutorials/04_tutorial_advection_diffusion.ipynb

...rials/05_tutorial_phasefield_spinodal_decomposition.ipynb

...e/tutorials/06_tutorial_phasefield_dentritic_growth.ipynb