References to non-existing icon files in the handlebars demos

[mfranzke]

I am using Pattern Lab Node v5.15.2 on Mac, with Node v12.13.1, using a handlebars Edition with the demo patterns installed.

Expected Behavior

No errors should come up on the developers console tab or in the network tab.

Actual Behavior

Two errors on missing files are being displayed (taken from the preview environment):

styleguide.html:758 GET https://patternlab-handlebars-preview.netlify.app/icons.svg net::ERR_ABORTED 404
styleguide.html:2612 GET https://patternlab-handlebars-preview.netlify.app/icons.svg net::ERR_ABORTED 404

Steps to Reproduce

Open https://patternlab-handlebars-preview.netlify.app/ and your webdeveloper tools.