Low level docs

[mgiulini]

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• You have sticked to Python. Please talk to us before adding other programming languages to HADDOCK3
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Closes #814

[VGPReys]

Do we want to add the {:target="_blank"} after the links so a new tab is created ?

[mgiulini]

mmm I don't know..that md code will be also visualized on github and I don't like having hundreds of pages opening while browsing things

[VGPReys]

Great improvements ! Nice work