title: Add extra icons to rocksolid icon picker
body: <p>Hi I need to add extra icons to rocksolid icon sets. I follwed the instructions in <a href="https://rocksolidthemes.com/de/contao/blog/iconfont-anpassen-icons-hinzufuegen" rel="nofollow noreferrer">https://rocksolidthemes.com/de/contao/blog/iconfont-anpassen-icons-hinzufuegen</a> and successfully downloaded the new icon set and copied to the desired folder. But the new icons are not showing in the picker. I need to know whether the new icons were lost when the rocksolid is upgraded? If yes, what is the remedy for this? Can I add more than one icon files in the configuration?</p>