Merge branch 'move_getting_started_to_docs' into 'NIFTy_8'

Add getting started to docs

See merge request !666
16 jobs for NIFTy_8 in 34 minutes and 30 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Static Checks
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check_no_asserts

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  Build Docker
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build_docker_from_scratch

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  Test
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test_mpi

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test_serial

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  Demo Runs
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run_bernoulli

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run_curve_fitting

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run_getting_density

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run_getting_started_1

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run_getting_started_2

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run_getting_started_3

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run_getting_started_mf

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run_ipynb0

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run_ipynb1

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run_meanfield

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run_nonlinearity_guide

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run_visual_vi

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