Merge branch 'pip_installation' into 'NIFTy_7'

Add instructions for installation via pip

See merge request !692
18 jobs for NIFTy_7 in 26 minutes and 57 seconds (queued for 6 seconds)
Status Name Job ID Coverage
  Static Checks
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  Build Docker
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  Test
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passed test_serial #1430171

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  Release
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  Demo Runs
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passed run_getting_started_1 #1430181

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passed run_getting_started_mf #1430187

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passed run_ipynb0 #1430177

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passed run_ipynb1 #1430179

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passed run_meanfield #1430196

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passed run_nonlinearity_guide #1430197

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passed run_visual_vi #1430194

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  Deploy
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