Add Flow Chart support

[sanket143]

Could use flowchart.js to render svg flowcharts

[fabiocolacio]

Hi @sanket143,

We do support flowcharts currently with mermaid. Does flowchart.js provide any advantages over mermaid (I don't really use either one)?

[mereghost]

@fabiocolacio while mermaid is pretty flexible, trying to do a proper flowchart results in a weird result, besides some elements being huge =/

flowchart.js gives you proper flowchart semantics/shapes and end up looking better.

[mereghost]

Just adding the link to the project website as, for flowchart, this is way cleaner than mermaid: https://flowchart.js.org/