Add mermaid experimental validation

changed milestone to %fixed before hackaton

assigned to @rplanel

added 49 commits

69a84f22...47eeea3f - 48 commits from branch dev
c0ef6d8a - Merge branch 'dev' into add_mermaid_experimentally

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added 2 commits

a96e50e3 - install mermaid
adab7be0 - Create a plugin + compo to hande mermaid tag (from https://gitlab.com/dokos/documentation)

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added 1 commit

c27be5da - Try it on AbiA and BREX

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@ftesson

It should work now. Wrap the mermaid code with <mermaid>

Example:

<mermaid>
graph LR;
    Chopin_2005[<a href='https://doi.org/10.1016/j.mib.2005.06.006'>Chopin et al., 2005</a>] --> Origin_0
    Origin_0[lactococcal plasmid  
<a href='https://ncbi.nlm.nih.gov/protein/AAA65072.1'>AAA65072.1</a>] --> Expressed_0[lactococci]
    Expressed_0[lactococci] ----> 936 & c2 & P335
    subgraph Title1[Reference]
        Chopin_2005
end
    subgraph Title2[System origin]
        Origin_0
end
    subgraph Title3[Expression species]
        Expressed_0
end
    subgraph Title4[Phage infected]
        936
        c2
        P335
end
    style Title1 fill:none,stroke:none,stroke-width:none
    style Title2 fill:none,stroke:none,stroke-width:none
    style Title3 fill:none,stroke:none,stroke-width:none
    style Title4 fill:none,stroke:none,stroke-width:none
</mermaid>