To edit the current font, this is the workflow:

go to https://icomoon.io/
In the menu, go to manage projects and import the json file from this folder and load it
Add new icons or exchange existing ones: if changing existing one, make sure the unicode stays the same (can be edited before exporting)
Go to "Generate SVG & More" and check the size of new icons (clicking on icons brings up the editor) -> scale new icons to match the size of existing ones
Go to "Generate font" tab, check unicodes are correct (can use any unicode, range > e900 is "custom range" and now preferred)
Download the font package and replace the files in this folder with new files
Using an online converter, convert the *.woff font into woff2 format (about half the file size)
Using another online converter, convert the woff2 font to base64 encoding for CSS
in index.css, replace the font string at the top, keep the "data:font/woff2;charset=utf-8;" and dont use octet-stream (browser compatibility).

enjoy your new icons in the UI :)

