Merge branch 'fix_doc' into 'NIFTy_5'

Fix doc

See merge request !371
11 jobs for NIFTy_5 in 22 minutes and 49 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build Docker
passed #969697
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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82.0%
 
  Release
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pages

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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_started_1

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run_getting_started_2

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passed #969704
run_getting_started_3

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passed #969701
run_ipynb

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  Deploy
passed pages:deploy

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