Merge branch 'fixdocs' into 'NIFTy_5'

Fix docs

See merge request !331
11 jobs for NIFTy_5 in 20 minutes and 42 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build Docker
passed #889323
build_docker_from_scratch

00:11:51

 
  Test
passed #889325
test_mpi

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passed #889324
test_serial

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80.0%
 
  Release
passed #889326
pages

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  Demo Runs
passed #889331
run_bernoulli

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passed #889332
run_curve_fitting

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passed #889328
run_getting_started_1

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passed #889329
run_getting_started_2

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passed #889330
run_getting_started_3

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passed #889327
run_ipynb

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  Deploy
passed pages:deploy

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