Replace static js files by yarn/npm dependencies

[baszoetekouw]

Please replace the static js files in client/public by proper yarn/npm modules (if available). That allows dependency tracking and vulnerability checking:

• canvg.js : https://github.com/canvg/canvg
• jspdf.js : https://github.com/parallax/jsPDF/tree/master
• rgbcolor.js : https://www.npmjs.com/package/rgbcolor/v/1.0.1
• svg2pdf.js : https://github.com/yWorks/svg2pdf.js