Merge branch 'demo_tweaks' into 'ducc0'

mention online documentation

See merge request !85
4 jobs for ducc0_0_10_0 in 17 minutes and 51 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build Docker
passed #1328722
build_docker

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  Testing
passed #1328724
test_clang

00:17:25

passed #1328723
test_gcc

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  Release
passed #1328725
release

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