integrate DOT with markdown for graph

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Description

I diged but not found gitlab-ce can easily draw charts.

DOT (graph description language) is really useful for charts like flow chart / ER chart / class diagrams.

Although it's ability limited in drawing sequence chart. I suggest it for mark down documents.

Proposal

Suggest allow include dot file(.dot) as picture , and rendering it use javascript clients.

Links / references

[what is dot (wiki)| https://en.wikipedia.org/wiki/DOT_(graph_description_language)]

[use graphviz dot for uml diagrams | http://www.ffnn.nl/pages/articles/media/uml-diagrams-using-graphviz-dot.php]`