Add support for download the diagram as SVG / PDF / PNG or HTML file to show and share with non technical user

[anantapdash]

Is your feature request related to a problem? Please describe.
I can see the diagrams, but I can't show it to other non tehnical users, downloding it would help.

Describe the solution you'd like
Allow the download the diagram as SVG / PDF / PNG or HTML file

[sta-zot]

Hi,
In such cases, I take screenshots.
Modern operating systems allow you to select an area that needs to be saved