[Features request] Mardown vendor gantt.

[liweiv]

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Description

gantt
title project plan
dateFormat YYYY-MM-DD

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https://mermaidjs.github.io/

Screenshots

[lafriks]

duplicate of #3340

JS can be also added using custom header including mermaidjs and adding init script

[lunny]

I would like add a gantt on milestones about issues.

[lafriks]

@lunny But this is something different requested here

[lunny]

@lafriks yes, I know but maybe it could be rendered by external tool.

[lafriks]

I would prefer other lib for that as this one is for markdown