Use the defined icon from the phosphor library

penyaskito → credited ckrina → .

penyaskito → credited ramyoo12 → .

Crediting ckrina for defining it, and ramyoo12 for helping finding it.

penyaskito → changed the visibility of the branch 3474758-use-the-defined to hidden.

For the record, the phosphor icon used is kanban 24x24.

For the toolbar one, I had to use the "bold" version, because the regular one looked to tiny.
For the navigation one, we use the regular one, and we have to replace fill color with "currentColor"

Attaching screenshots.

The screenshots look exactly as they should, so RTBCing this.

MR merged! Thank you

Automatically closed - issue fixed for 2 weeks with no activity.